build: separate vpack creation from vpack publication (#19380)

This will allow us to publish vpacks without making the build fail
waiting for us to *merge* those vpacks into Windows. It also gives us
better control over when and where the vpack update gets merged.

(cherry picked from commit 6b428577b9)
Service-Card-Id: PVTI_lADOAF3p4s4BBcTlzgfLAks
Service-Version: 1.24

build/StoreSubmission/Preview/SBConfig.json

@@ -20,6 +20,7 @@
     "DisableAutoPackageNameFormatting": false
   },
   "appSubmission": {
+    "appId": "9N8G5RFZ9XK3",
     "productId": "00014050269303149694",
     "targetPublishMode": "NotSet",
     "targetPublishDate": null,

build/StoreSubmission/Stable/SBConfig.json

@@ -20,6 +20,7 @@
     "DisableAutoPackageNameFormatting": false
   },
   "appSubmission": {
+    "appId": "9N0DX20HK701",
     "productId": "00013926773940052066",
     "targetPublishMode": "NotSet",
     "targetPublishDate": null,

build/config/GitCheckin.json

@@ -4,7 +4,7 @@
         "collection": "microsoft",
         "project": "OS",
         "repo": "os.2020",
-        "name": "official/rs_we_adept_e4d2",
+        "name": "official/ge_current_directwinpd_deep",
         "workitem": "38106206",
         "CheckinFiles": [
           {

build/pipelines/ob-release.yml

@@ -53,8 +53,12 @@ parameters:
     displayName: "Publish Symbols to MSDL"
     type: boolean
     default: true
+  - name: createVpack
+    displayName: "Create a VPack for Windows"
+    type: boolean
+    default: false
   - name: publishVpackToWindows
-    displayName: "Publish VPack to Windows"
+    displayName: "Publish above VPack to Windows"
     type: boolean
     default: false
 
@@ -89,6 +93,7 @@ extends:
       clientId: $(SigningOriginalClientId)
     terminalInternalPackageVersion: ${{ parameters.terminalInternalPackageVersion }}
     publishSymbolsToPublic: ${{ parameters.publishSymbolsToPublic }}
+    createVpack: ${{ parameters.createVpack }}
     publishVpackToWindows: ${{ parameters.publishVpackToWindows }}
     symbolPublishingSubscription: $(SymbolPublishingServiceConnection)
     symbolPublishingProject: $(SymbolPublishingProject)

build/pipelines/templates-v2/pipeline-onebranch-full-release-build.yml

@@ -49,6 +49,9 @@ parameters:
   - name: symbolExpiryTime
     type: string
     default: 36530 # This is the default from PublishSymbols@2
+  - name: createVpack
+    type: boolean
+    default: false
   - name: publishVpackToWindows
     type: boolean
     default: false
@@ -192,8 +195,8 @@ extends:
                   ob_outputDirectory: $(JobOutputDirectory)
                   ob_artifactBaseName: $(JobOutputArtifactName)
                   ### This job is also in charge of submitting the vpack to Windows if it's enabled
-                  ob_createvpack_enabled: ${{ and(parameters.buildTerminal, parameters.publishVpackToWindows) }}
-                  ob_updateOSManifest_enabled: ${{ and(parameters.buildTerminal, parameters.publishVpackToWindows) }}
+                  ob_createvpack_enabled: ${{ and(parameters.buildTerminal, parameters.createVpack) }}
+                  ob_updateOSManifest_enabled: ${{ and(parameters.buildTerminal, parameters.createVpack, parameters.publishVpackToWindows) }}
                   ### If enabled above, these options are in play.
                   ob_createvpack_packagename: 'WindowsTerminal.app'
                   ob_createvpack_owneralias: 'conhost@microsoft.com'
@@ -229,7 +232,7 @@ extends:
                       New-Item "$(JobOutputDirectory)/vpack" -Type Directory
                     displayName: Make sure the vpack directory exists
 
-                  - ${{ if parameters.publishVpackToWindows }}:
+                  - ${{ if parameters.createVpack }}:
                     - pwsh: |-
                         Copy-Item -Verbose -Path "$(MsixBundlePath)" -Destination (Join-Path "$(JobOutputDirectory)/vpack" 'Microsoft.WindowsTerminal_8wekyb3d8bbwe.msixbundle')
                       displayName: Stage msixbundle for vpack

doc/cascadia/profiles.schema.json

@@ -2302,8 +2302,15 @@
       "additionalProperties": false,
       "properties": {
         "id": {
-          "description": "The ID of the command this keybinding should execute.",
-          "type": "string"
+          "description": "The ID of the command this keybinding should execute (or null to disable a default).",
+          "oneOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
         },
         "keys": {
           "description": "Defines the key combinations used to call the command. It must be composed of...\n -any number of modifiers (ctrl/alt/shift)\n -a non-modifier key",

src/cascadia/TerminalApp/Remoting.cpp

@@ -44,10 +44,6 @@ namespace winrt::TerminalApp::implementation
     {
         _args = { value.begin(), value.end() };
         _parseResult = _parsed.ParseArgs(_args);
-        if (_parseResult == 0)
-        {
-            _parsed.ValidateStartupCommands();
-        }
     }
 
     winrt::com_array<winrt::hstring> CommandlineArgs::Commandline()

src/cascadia/TerminalApp/TabManagement.cpp

@@ -157,12 +157,7 @@ namespace winrt::TerminalApp::implementation
         // Set this tab's icon to the icon from the content
         _UpdateTabIcon(*newTabImpl);
 
-        // This is necessary, because WinUI does not have support for middle clicks.
-        // Its Tapped event doesn't provide the information what button was used either.
         tabViewItem.PointerPressed({ this, &TerminalPage::_OnTabPointerPressed });
-        tabViewItem.PointerReleased({ this, &TerminalPage::_OnTabPointerReleased });
-        tabViewItem.PointerExited({ this, &TerminalPage::_OnTabPointerExited });
-        tabViewItem.PointerEntered({ this, &TerminalPage::_OnTabPointerEntered });
 
         // When the tab requests close, try to close it (prompt for approval, if required)
         newTabImpl->CloseRequested([weakTab, weakThis{ get_weak() }](auto&& /*s*/, auto&& /*e*/) {
@@ -664,7 +659,7 @@ namespace winrt::TerminalApp::implementation
     // Method Description:
     // - returns a tab corresponding to a view item. This might return null,
     //   so make sure to check the result!
-    winrt::TerminalApp::Tab TerminalPage::_GetTabByTabViewItem(const Microsoft::UI::Xaml::Controls::TabViewItem& tabViewItem) const noexcept
+    winrt::TerminalApp::Tab TerminalPage::_GetTabByTabViewItem(const IInspectable& tabViewItem) const noexcept
     {
         uint32_t tabIndexFromControl{};
         const auto items{ _tabView.TabItems() };
@@ -876,60 +871,64 @@ namespace winrt::TerminalApp::implementation
         _UpdateTabView();
     }
 
-    // Method Description:
-    // - Additional responses to clicking on a TabView's item. Currently, just remove tab with middle click
-    // Arguments:
-    // - sender: the control that originated this event (TabViewItem)
-    // - eventArgs: the event's constituent arguments
-    void TerminalPage::_OnTabPointerPressed(const IInspectable& sender, const Windows::UI::Xaml::Input::PointerRoutedEventArgs& eventArgs)
+    void TerminalPage::_OnTabPointerPressed(const IInspectable& sender, const Windows::UI::Xaml::Input::PointerRoutedEventArgs& e)
     {
-        if (eventArgs.GetCurrentPoint(nullptr).Properties().IsMiddleButtonPressed())
+        if (!_tabItemMiddleClickHookEnabled || !e.GetCurrentPoint(nullptr).Properties().IsMiddleButtonPressed())
         {
-            if (const auto tabViewItem{ sender.try_as<MUX::Controls::TabViewItem>() })
-            {
-                _tabPointerMiddleButtonPressed = tabViewItem.CapturePointer(eventArgs.Pointer());
-                _tabPointerMiddleButtonExited = false;
-            }
-            eventArgs.Handled(true);
+            return;
         }
+
+        const auto tabViewItem = sender.try_as<MUX::Controls::TabViewItem>();
+        if (!tabViewItem || !tabViewItem.CapturePointer(e.Pointer()))
+        {
+            return;
+        }
+
+        _tabItemMiddleClickExited = false;
+
+        _tabItemMiddleClickPointerEntered = tabViewItem.PointerEntered(winrt::auto_revoke, [this](auto&&, auto&& e) {
+            _tabItemMiddleClickExited = false;
+            e.Handled(true);
+        });
+        _tabItemMiddleClickPointerExited = tabViewItem.PointerExited(winrt::auto_revoke, [this](auto&&, auto&& e) {
+            _tabItemMiddleClickExited = true;
+            e.Handled(true);
+        });
+        _tabItemMiddleClickPointerCaptureLost = tabViewItem.PointerCaptureLost(winrt::auto_revoke, [this](auto&& sender, auto&& e) {
+            // The WinUI TabView calls CapturePointer() internally and it's not reference counted,
+            // so when it calls ReleasePointerCapture() in its PointerReleased handler,
+            // we get a PointerCaptureLost before we receive the PointerReleased event.
+            // This makes typical handling of PointerReleased events on our side difficult.
+            // Well, whatever, now we just hook PointerCaptureLost because we know WinUI will trigger it.
+
+            _tabItemMiddleClickPointerEntered.revoke();
+            _tabItemMiddleClickPointerExited.revoke();
+            _tabItemMiddleClickPointerCaptureLost.revoke();
+
+            if (!_tabItemMiddleClickExited && !e.GetCurrentPoint(nullptr).Properties().IsMiddleButtonPressed())
+            {
+                _OnTabPointerReleasedCloseTab(std::move(sender));
+            }
+
+            e.Handled(true);
+        });
+        e.Handled(true);
     }
 
-    // Method Description:
-    // - Tracking pointer state for tab remove
-    // Arguments:
-    // - sender: the control that originated this event (TabViewItem)
-    // - eventArgs: the event's constituent arguments
-    void TerminalPage::_OnTabPointerReleased(const IInspectable& sender, const Windows::UI::Xaml::Input::PointerRoutedEventArgs& eventArgs)
+    safe_void_coroutine TerminalPage::_OnTabPointerReleasedCloseTab(IInspectable sender)
     {
-        if (_tabPointerMiddleButtonPressed && !eventArgs.GetCurrentPoint(nullptr).Properties().IsMiddleButtonPressed())
-        {
-            _tabPointerMiddleButtonPressed = false;
-            if (auto tabViewItem{ sender.try_as<MUX::Controls::TabViewItem>() })
-            {
-                tabViewItem.ReleasePointerCapture(eventArgs.Pointer());
-                if (!_tabPointerMiddleButtonExited)
-                {
-                    _OnTabPointerReleasedCloseTab(std::move(tabViewItem));
-                }
-            }
-            eventArgs.Handled(true);
-        }
-    }
-
-    safe_void_coroutine TerminalPage::_OnTabPointerReleasedCloseTab(winrt::Microsoft::UI::Xaml::Controls::TabViewItem sender)
-    {
-        const auto tab = _GetTabByTabViewItem(sender);
-        if (!tab)
-        {
-            co_return;
-        }
-
         // WinUI asynchronously updates its tab view items, so it may happen that we're given a
         // `TabViewItem` that still contains a `Tab` which has actually already been removed.
         // First we must yield once, to flush out whatever TabView is currently doing.
         const auto strong = get_strong();
         co_await wil::resume_foreground(Dispatcher());
 
+        const auto tab = _GetTabByTabViewItem(sender);
+        if (!tab)
+        {
+            co_return;
+        }
+
         // `tab.Shutdown()` in `_RemoveTab()` sets the content to null = This checks if the tab is closed.
         if (tab.Content())
         {
@@ -937,34 +936,6 @@ namespace winrt::TerminalApp::implementation
         }
     }
 
-    // Method Description:
-    // - Tracking pointer state for tab remove
-    // Arguments:
-    // - sender: the control that originated this event (TabViewItem)
-    // - eventArgs: the event's constituent arguments
-    void TerminalPage::_OnTabPointerEntered(const IInspectable& /*sender*/, const Windows::UI::Xaml::Input::PointerRoutedEventArgs& eventArgs)
-    {
-        if (eventArgs.GetCurrentPoint(nullptr).Properties().IsMiddleButtonPressed())
-        {
-            _tabPointerMiddleButtonExited = false;
-            eventArgs.Handled(true);
-        }
-    }
-
-    // Method Description:
-    // - Tracking pointer state for tab remove
-    // Arguments:
-    // - sender: the control that originated this event (TabViewItem)
-    // - eventArgs: the event's constituent arguments
-    void TerminalPage::_OnTabPointerExited(const IInspectable& /*sender*/, const Windows::UI::Xaml::Input::PointerRoutedEventArgs& eventArgs)
-    {
-        if (eventArgs.GetCurrentPoint(nullptr).Properties().IsMiddleButtonPressed())
-        {
-            _tabPointerMiddleButtonExited = true;
-            eventArgs.Handled(true);
-        }
-    }
-
     void TerminalPage::_UpdatedSelectedTab(const winrt::TerminalApp::Tab& tab)
     {
         // Unfocus all the tabs.

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -60,8 +60,42 @@ namespace winrt
 
 namespace clipboard
 {
-    wil::unique_close_clipboard_call open(HWND hwnd)
+    static SRWLOCK lock = SRWLOCK_INIT;
+
+    struct ClipboardHandle
     {
+        explicit ClipboardHandle(bool open) :
+            _open{ open }
+        {
+        }
+
+        ~ClipboardHandle()
+        {
+            if (_open)
+            {
+                ReleaseSRWLockExclusive(&lock);
+                CloseClipboard();
+            }
+        }
+
+        explicit operator bool() const noexcept
+        {
+            return _open;
+        }
+
+    private:
+        bool _open = false;
+    };
+
+    ClipboardHandle open(HWND hwnd)
+    {
+        // Turns out, OpenClipboard/CloseClipboard are not thread-safe whatsoever,
+        // and on CloseClipboard, the GetClipboardData handle may get freed.
+        // The problem is that WinUI also uses OpenClipboard (through WinRT which uses OLE),
+        // and so even with this mutex we can still crash randomly if you copy something via WinUI.
+        // Makes you wonder how many Windows apps are subtly broken, huh.
+        AcquireSRWLockExclusive(&lock);
+
         bool success = false;
 
         // OpenClipboard may fail to acquire the internal lock --> retry.
@@ -80,7 +114,12 @@ namespace clipboard
             Sleep(sleep);
         }
 
-        return wil::unique_close_clipboard_call{ success };
+        if (!success)
+        {
+            ReleaseSRWLockExclusive(&lock);
+        }
+
+        return ClipboardHandle{ success };
     }
 
     void write(wil::zwstring_view text, std::string_view html, std::string_view rtf)
@@ -344,6 +383,8 @@ namespace winrt::TerminalApp::implementation
         {
             const auto visibility = theme.Tab() ? theme.Tab().ShowCloseButton() : Settings::Model::TabCloseButtonVisibility::Always;
 
+            _tabItemMiddleClickHookEnabled = visibility == Settings::Model::TabCloseButtonVisibility::Never;
+
             switch (visibility)
             {
             case Settings::Model::TabCloseButtonVisibility::Never:
@@ -3808,6 +3849,8 @@ namespace winrt::TerminalApp::implementation
                                     theme.Tab().ShowCloseButton() :
                                     Settings::Model::TabCloseButtonVisibility::Always;
 
+        _tabItemMiddleClickHookEnabled = visibility == Settings::Model::TabCloseButtonVisibility::Never;
+
         for (const auto& tab : _tabs)
         {
             tab.CloseButtonVisibility(visibility);

src/cascadia/TerminalApp/TerminalPage.h

@@ -391,7 +391,7 @@ namespace winrt::TerminalApp::implementation
         std::optional<uint32_t> _GetTabIndex(const TerminalApp::Tab& tab) const noexcept;
         TerminalApp::Tab _GetFocusedTab() const noexcept;
         winrt::com_ptr<Tab> _GetFocusedTabImpl() const noexcept;
-        TerminalApp::Tab _GetTabByTabViewItem(const Microsoft::UI::Xaml::Controls::TabViewItem& tabViewItem) const noexcept;
+        TerminalApp::Tab _GetTabByTabViewItem(const IInspectable& tabViewItem) const noexcept;
 
         void _HandleClosePaneRequested(std::shared_ptr<Pane> pane);
         safe_void_coroutine _SetFocusedTab(const winrt::TerminalApp::Tab tab);
@@ -435,13 +435,18 @@ namespace winrt::TerminalApp::implementation
         void _TabDragStarted(const IInspectable& sender, const IInspectable& eventArgs);
         void _TabDragCompleted(const IInspectable& sender, const IInspectable& eventArgs);
 
-        bool _tabPointerMiddleButtonPressed{ false };
-        bool _tabPointerMiddleButtonExited{ false };
+        // BODGY: WinUI's TabView has a broken close event handler:
+        // If the close button is disabled, middle-clicking the tab raises no close
+        // event. Because that's dumb, we implement our own middle-click handling.
+        // `_tabItemMiddleClickHookEnabled` is true whenever the close button is hidden,
+        // and that enables all of the rest of this machinery (and this workaround).
+        bool _tabItemMiddleClickHookEnabled = false;
+        bool _tabItemMiddleClickExited = false;
+        PointerEntered_revoker _tabItemMiddleClickPointerEntered;
+        PointerExited_revoker _tabItemMiddleClickPointerExited;
+        PointerCaptureLost_revoker _tabItemMiddleClickPointerCaptureLost;
         void _OnTabPointerPressed(const IInspectable& sender, const Windows::UI::Xaml::Input::PointerRoutedEventArgs& eventArgs);
-        void _OnTabPointerReleased(const IInspectable& sender, const Windows::UI::Xaml::Input::PointerRoutedEventArgs& eventArgs);
-        safe_void_coroutine _OnTabPointerReleasedCloseTab(winrt::Microsoft::UI::Xaml::Controls::TabViewItem sender);
-        void _OnTabPointerEntered(const IInspectable& sender, const Windows::UI::Xaml::Input::PointerRoutedEventArgs& eventArgs);
-        void _OnTabPointerExited(const IInspectable& sender, const Windows::UI::Xaml::Input::PointerRoutedEventArgs& eventArgs);
+        safe_void_coroutine _OnTabPointerReleasedCloseTab(IInspectable sender);
 
         void _OnTabSelectionChanged(const IInspectable& sender, const Windows::UI::Xaml::Controls::SelectionChangedEventArgs& eventArgs);
         void _OnTabItemsChanged(const IInspectable& sender, const Windows::Foundation::Collections::IVectorChangedEventArgs& eventArgs);

src/cascadia/TerminalApp/TerminalPaneContent.cpp

@@ -279,7 +279,7 @@ namespace winrt::TerminalApp::implementation
                     auto sounds{ _profile.BellSound() };
                     if (sounds && sounds.Size() > 0)
                     {
-                        winrt::hstring soundPath{ wil::ExpandEnvironmentStringsW<std::wstring>(sounds.GetAt(rand() % sounds.Size()).c_str()) };
+                        winrt::hstring soundPath{ sounds.GetAt(rand() % sounds.Size()).Resolved() };
                         winrt::Windows::Foundation::Uri uri{ soundPath };
                         _playBellSound(uri);
                     }

src/cascadia/TerminalApp/TerminalWindow.cpp

@@ -1048,6 +1048,11 @@ namespace winrt::TerminalApp::implementation
         // (or called TerminalWindow::Initialize)
         if (_appArgs->ExitCode() == 0)
         {
+            // The existing logic (before this commit) strictly relied on
+            // ValidateStartupCommands() only to be called for new windows.
+            // It modifies the actions it stores.
+            parsedArgs.ValidateStartupCommands();
+
             // If the size of the arguments list is 1,
             // then it contains only the executable name and no other arguments.
             _hasCommandLineArguments = _appArgs->CommandlineRef().size() > 1;

src/cascadia/TerminalControl/ControlInteractivity.cpp

@@ -485,7 +485,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
     // - modifiers: The modifiers pressed during this event, in the form of a VirtualKeyModifiers
     // - delta: the mouse wheel delta that triggered this event.
     bool ControlInteractivity::MouseWheel(const ::Microsoft::Terminal::Core::ControlKeyStates modifiers,
-                                          const int32_t delta,
+                                          const Core::Point delta,
                                           const Core::Point pixelPosition,
                                           const Control::MouseButtonState buttonState)
     {
@@ -506,9 +506,9 @@ namespace winrt::Microsoft::Terminal::Control::implementation
             // PointerPoint to work with. So, we're just going to do a
             // mousewheel event manually
             return _sendMouseEventHelper(terminalPosition,
-                                         WM_MOUSEWHEEL,
+                                         delta.Y != 0 ? WM_MOUSEWHEEL : WM_MOUSEHWHEEL,
                                          modifiers,
-                                         ::base::saturated_cast<short>(delta),
+                                         ::base::saturated_cast<short>(delta.Y != 0 ? delta.Y : delta.X),
                                          buttonState);
         }
 
@@ -517,15 +517,15 @@ namespace winrt::Microsoft::Terminal::Control::implementation
 
         if (ctrlPressed && shiftPressed && _core->Settings().ScrollToChangeOpacity())
         {
-            _mouseTransparencyHandler(delta);
+            _mouseTransparencyHandler(delta.Y);
         }
         else if (ctrlPressed && !shiftPressed && _core->Settings().ScrollToZoom())
         {
-            _mouseZoomHandler(delta);
+            _mouseZoomHandler(delta.Y);
         }
         else
         {
-            _mouseScrollHandler(delta, pixelPosition, WI_IsFlagSet(buttonState, MouseButtonState::IsLeftButtonDown));
+            _mouseScrollHandler(delta.Y, pixelPosition, WI_IsFlagSet(buttonState, MouseButtonState::IsLeftButtonDown));
         }
         return false;
     }
@@ -659,7 +659,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         return _core->IsVtMouseModeEnabled();
     }
 
-    bool ControlInteractivity::_shouldSendAlternateScroll(const ::Microsoft::Terminal::Core::ControlKeyStates modifiers, const int32_t delta)
+    bool ControlInteractivity::_shouldSendAlternateScroll(const ::Microsoft::Terminal::Core::ControlKeyStates modifiers, const Core::Point delta)
     {
         // If the user is holding down Shift, suppress mouse events
         // TODO GH#4875: disable/customize this functionality
@@ -667,7 +667,14 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         {
             return false;
         }
-        return _core->ShouldSendAlternateScroll(WM_MOUSEWHEEL, delta);
+        if (delta.Y != 0)
+        {
+            return _core->ShouldSendAlternateScroll(WM_MOUSEWHEEL, delta.Y);
+        }
+        else
+        {
+            return _core->ShouldSendAlternateScroll(WM_MOUSEHWHEEL, delta.X);
+        }
     }
 
     // Method Description:

src/cascadia/TerminalControl/ControlInteractivity.h

@@ -74,7 +74,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         void TouchReleased();
 
         bool MouseWheel(const ::Microsoft::Terminal::Core::ControlKeyStates modifiers,
-                        const int32_t delta,
+                        const Core::Point delta,
                         const Core::Point pixelPosition,
                         const Control::MouseButtonState state);
 
@@ -153,7 +153,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
 
         void _hyperlinkHandler(const std::wstring_view uri);
         bool _canSendVTMouseInput(const ::Microsoft::Terminal::Core::ControlKeyStates modifiers);
-        bool _shouldSendAlternateScroll(const ::Microsoft::Terminal::Core::ControlKeyStates modifiers, const int32_t delta);
+        bool _shouldSendAlternateScroll(const ::Microsoft::Terminal::Core::ControlKeyStates modifiers, const Core::Point delta);
 
         til::point _getTerminalPosition(const til::point pixelPosition, bool roundToNearestCell);
 

src/cascadia/TerminalControl/ControlInteractivity.idl

@@ -60,7 +60,7 @@ namespace Microsoft.Terminal.Control
         void TouchReleased();
 
         Boolean MouseWheel(Microsoft.Terminal.Core.ControlKeyStates modifiers,
-                           Int32 delta,
+                           Microsoft.Terminal.Core.Point delta,
                            Microsoft.Terminal.Core.Point pixelPosition,
                            MouseButtonState state);
 

src/cascadia/TerminalControl/IMouseWheelListener.idl

@@ -11,6 +11,6 @@ namespace Microsoft.Terminal.Control
     [uuid("65b8b8c5-988f-43ff-aba9-e89368da1598")]
     interface IMouseWheelListener
     {
-        Boolean OnMouseWheel(Windows.Foundation.Point coord, Int32 delta, Boolean leftButtonDown, Boolean midButtonDown, Boolean rightButtonDown);
+        Boolean OnMouseWheel(Windows.Foundation.Point coord, Microsoft.Terminal.Core.Point delta, Boolean leftButtonDown, Boolean midButtonDown, Boolean rightButtonDown);
     }
 }

src/cascadia/TerminalControl/TermControl.cpp

@@ -2164,15 +2164,11 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         RestorePointerCursor.raise(*this, nullptr);
 
         const auto point = args.GetCurrentPoint(*this);
-        // GH#10329 - we don't need to handle horizontal scrolls. Only vertical ones.
-        // So filter out the horizontal ones.
-        if (point.Properties().IsHorizontalMouseWheel())
-        {
-            return;
-        }
-
+        auto delta = point.Properties().MouseWheelDelta();
         auto result = _interactivity.MouseWheel(ControlKeyStates{ args.KeyModifiers() },
-                                                point.Properties().MouseWheelDelta(),
+                                                point.Properties().IsHorizontalMouseWheel() ?
+                                                    Core::Point{ delta, 0 } :
+                                                    Core::Point{ 0, delta },
                                                 _toTerminalOrigin(point.Position()),
                                                 TermControl::GetPressedMouseButtons(point));
         if (result)
@@ -2192,7 +2188,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
     // - delta: the mouse wheel delta that triggered this event.
     // - state: the state for each of the mouse buttons individually (pressed/unpressed)
     bool TermControl::OnMouseWheel(const Windows::Foundation::Point location,
-                                   const int32_t delta,
+                                   const Core::Point delta,
                                    const bool leftButtonDown,
                                    const bool midButtonDown,
                                    const bool rightButtonDown)

src/cascadia/TerminalControl/TermControl.h

@@ -147,7 +147,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
 
         bool OnDirectKeyEvent(const uint32_t vkey, const uint8_t scanCode, const bool down);
 
-        bool OnMouseWheel(const Windows::Foundation::Point location, const int32_t delta, const bool leftButtonDown, const bool midButtonDown, const bool rightButtonDown);
+        bool OnMouseWheel(const Windows::Foundation::Point location, const winrt::Microsoft::Terminal::Core::Point delta, const bool leftButtonDown, const bool midButtonDown, const bool rightButtonDown);
 
         ~TermControl();
 

src/cascadia/TerminalSettingsEditor/ProfileViewModel.cpp

@@ -720,7 +720,6 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
             }
         }
         _MarkDuplicateBellSoundDirectories();
-        _CheckBellSoundsExistence();
         _NotifyChanges(L"CurrentBellSounds");
     }
 
@@ -732,19 +731,14 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
     {
         if (!_profile.HasBellSound())
         {
-            std::vector<hstring> newSounds;
+            std::vector<IMediaResource> newSounds;
             if (const auto inheritedSounds = _profile.BellSound())
             {
-                // copy inherited bell sounds to the current layer
-                newSounds.reserve(inheritedSounds.Size());
-                for (const auto sound : inheritedSounds)
-                {
-                    newSounds.push_back(sound);
-                }
+                newSounds = wil::to_vector(inheritedSounds);
             }
             // if we didn't inherit any bell sounds,
             // we should still set the bell sound to an empty list (instead of null)
-            _profile.BellSound(winrt::single_threaded_vector<hstring>(std::move(newSounds)));
+            _profile.BellSound(winrt::single_threaded_vector(std::move(newSounds)));
         }
     }
 
@@ -768,56 +762,35 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
         }
     }
 
-    // Method Description:
-    // - Check if the bell sounds exist on disk. Mark any that don't exist
-    //   so that they show the appropriate UI
-    safe_void_coroutine ProfileViewModel::_CheckBellSoundsExistence()
+    BellSoundViewModel::BellSoundViewModel(const Model::IMediaResource& resource) :
+        _resource{ resource }
     {
-        co_await winrt::resume_background();
-        std::vector<Editor::BellSoundViewModel> markedSounds;
-        for (auto&& sound : _CurrentBellSounds)
+        if (_resource.Ok() && _resource.Path() != _resource.Resolved())
         {
-            if (!std::filesystem::exists(std::wstring_view{ sound.Path() }))
-            {
-                markedSounds.push_back(sound);
-            }
+            // If the resource was resolved to something other than its path, show the path!
+            _ShowDirectory = true;
         }
-
-        co_await winrt::resume_foreground(_dispatcher);
-        for (auto&& sound : markedSounds)
-        {
-            get_self<BellSoundViewModel>(sound)->FileExists(false);
-        }
-    }
-
-    BellSoundViewModel::BellSoundViewModel(hstring path) :
-        _Path{ path }
-    {
-        PropertyChanged([this](auto&&, const PropertyChangedEventArgs& args) {
-            if (args.PropertyName() == L"FileExists")
-            {
-                _NotifyChanges(L"DisplayPath", L"SubText");
-            }
-        });
     }
 
     hstring BellSoundViewModel::DisplayPath() const
     {
-        if (_FileExists)
+        if (_resource.Ok())
         {
-            // filename
-            const std::filesystem::path filePath{ std::wstring_view{ _Path } };
+            // filename; start from the resolved path to show where it actually landed
+            auto resolvedPath{ _resource.Resolved() };
+            const std::filesystem::path filePath{ std::wstring_view{ resolvedPath } };
             return hstring{ filePath.filename().wstring() };
         }
-        return _Path;
+        return _resource.Path();
     }
 
     hstring BellSoundViewModel::SubText() const
     {
-        if (_FileExists)
+        if (_resource.Ok())
         {
             // Directory
-            const std::filesystem::path filePath{ std::wstring_view{ _Path } };
+            auto resolvedPath{ _resource.Resolved() };
+            const std::filesystem::path filePath{ std::wstring_view{ resolvedPath } };
             return hstring{ filePath.parent_path().wstring() };
         }
         return RS_(L"Profile_BellSoundNotFound");
@@ -825,17 +798,22 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
 
     hstring ProfileViewModel::BellSoundPreview()
     {
-        const auto& currentSound = BellSound();
-        if (!currentSound || currentSound.Size() == 0)
+        if (!_CurrentBellSounds || _CurrentBellSounds.Size() == 0)
         {
             return RS_(L"Profile_BellSoundPreviewDefault");
         }
-        else if (currentSound.Size() == 1)
+        if (_CurrentBellSounds.Size() > 1)
         {
-            std::filesystem::path filePath{ std::wstring_view{ currentSound.GetAt(0) } };
-            return hstring{ filePath.filename().wstring() };
+            return RS_(L"Profile_BellSoundPreviewMultiple");
         }
-        return RS_(L"Profile_BellSoundPreviewMultiple");
+
+        const auto currentBellSound = _CurrentBellSounds.GetAt(0);
+        if (currentBellSound.FileExists())
+        {
+            return currentBellSound.DisplayPath();
+        }
+
+        return RS_(L"Profile_BellSoundNotFound");
     }
 
     void ProfileViewModel::RequestAddBellSound(hstring path)
@@ -844,9 +822,10 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
         // copy it over to the current layer and apply modifications
         _PrepareModelForBellSoundModification();
 
-        // No need to check if the file exists. We came from the FilePicker. That's good enough.
-        _CurrentBellSounds.Append(winrt::make<BellSoundViewModel>(path));
-        _profile.BellSound().Append(path);
+        auto bellResource{ MediaResourceHelper::FromString(path) };
+        bellResource.Resolve(path); // No need to check if the file exists. We came from the FilePicker. That's good enough.
+        _CurrentBellSounds.Append(winrt::make<BellSoundViewModel>(bellResource));
+        _profile.BellSound().Append(bellResource);
         _NotifyChanges(L"CurrentBellSounds");
     }
 

src/cascadia/TerminalSettingsEditor/ProfileViewModel.h

@@ -30,13 +30,16 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
     struct BellSoundViewModel : BellSoundViewModelT<BellSoundViewModel>, ViewModelHelper<BellSoundViewModel>
     {
     public:
-        BellSoundViewModel(hstring path);
+        BellSoundViewModel(const Model::IMediaResource& resource);
 
+        hstring Path() const { return _resource.Path(); }
+        bool FileExists() const { return _resource.Ok(); }
         hstring DisplayPath() const;
         hstring SubText() const;
-        VIEW_MODEL_OBSERVABLE_PROPERTY(bool, FileExists, true);
-        VIEW_MODEL_OBSERVABLE_PROPERTY(hstring, Path);
         VIEW_MODEL_OBSERVABLE_PROPERTY(bool, ShowDirectory);
+
+    private:
+        Model::IMediaResource _resource;
     };
 
     struct ProfileViewModel : ProfileViewModelT<ProfileViewModel>, ViewModelHelper<ProfileViewModel>
@@ -190,7 +193,6 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
         void _InitializeCurrentBellSounds();
         void _PrepareModelForBellSoundModification();
         void _MarkDuplicateBellSoundDirectories();
-        safe_void_coroutine _CheckBellSoundsExistence();
         static Windows::Foundation::Collections::IObservableVector<Editor::Font> _MonospaceFontList;
         static Windows::Foundation::Collections::IObservableVector<Editor::Font> _FontList;
         static Windows::Foundation::Collections::IVector<Windows::Foundation::IInspectable> _BuiltInIcons;

src/cascadia/TerminalSettingsEditor/ProfileViewModel.idl

@@ -27,7 +27,7 @@ namespace Microsoft.Terminal.Settings.Editor
 
     runtimeclass BellSoundViewModel : Windows.UI.Xaml.Data.INotifyPropertyChanged
     {
-        String Path;
+        String Path { get; };
         String DisplayPath { get; };
         String SubText { get; };
         Boolean ShowDirectory { get; };
@@ -149,7 +149,7 @@ namespace Microsoft.Terminal.Settings.Editor
         OBSERVABLE_PROJECTED_PROFILE_SETTING(Boolean, SnapOnInput);
         OBSERVABLE_PROJECTED_PROFILE_SETTING(Boolean, AltGrAliasing);
         OBSERVABLE_PROJECTED_PROFILE_SETTING(Microsoft.Terminal.Settings.Model.BellStyle, BellStyle);
-        OBSERVABLE_PROJECTED_PROFILE_SETTING(Windows.Foundation.Collections.IVector<String>, BellSound);
+        OBSERVABLE_PROJECTED_PROFILE_SETTING(Windows.Foundation.Collections.IVector<Microsoft.Terminal.Settings.Model.IMediaResource>, BellSound);
         OBSERVABLE_PROJECTED_PROFILE_SETTING(Boolean, Elevate);
         OBSERVABLE_PROJECTED_PROFILE_SETTING(Boolean, ReloadEnvironmentVariables);
         OBSERVABLE_PROJECTED_PROFILE_SETTING(Boolean, RightClickContextMenu);

src/cascadia/TerminalSettingsModel/CascadiaSettingsSerialization.cpp

@@ -559,6 +559,7 @@ bool SettingsLoader::AddDynamicProfileFolders()
         folderEntry->Inlining(FolderEntryInlining::Auto);
         folderEntry->RawEntries(winrt::single_threaded_vector<Model::NewTabMenuEntry>({ *matchProfilesEntry }));
 
+        // NewTabMenu is guaranteed to exist by FixupUserSettings, which runs before this fixup.
         userSettings.globals->NewTabMenu().Append(folderEntry.as<Model::NewTabMenuEntry>());
         state->SSHFolderGenerated(true);
         return true;
@@ -689,6 +690,16 @@ bool SettingsLoader::FixupUserSettings()
         fixedUp = true;
     }
 
+    // Terminal 1.24
+    // Ensure that the user always has a newTabMenu. We used to do this last, after
+    // resolving all of the new tab menu entries, but there was no conceivable reason
+    // that it should happen so late.
+    if (!userSettings.globals->HasNewTabMenu())
+    {
+        userSettings.globals->NewTabMenu(winrt::single_threaded_vector<Model::NewTabMenuEntry>({ Model::RemainingProfilesEntry{} }));
+        // This one does not need to be written back to the settings file immediately, it can wait until we write one for another reason.
+    }
+
     return fixedUp;
 }
 
@@ -1263,8 +1274,8 @@ try
     // DisableDeletedProfiles returns true whenever we encountered any new generated/dynamic profiles.
     // Similarly FixupUserSettings returns true, when it encountered settings that were patched up.
     mustWriteToDisk |= loader.DisableDeletedProfiles();
-    mustWriteToDisk |= loader.AddDynamicProfileFolders();
     mustWriteToDisk |= loader.FixupUserSettings();
+    mustWriteToDisk |= loader.AddDynamicProfileFolders();
 
     // If this throws, the app will catch it and use the default settings.
     const auto settings = winrt::make_self<CascadiaSettings>(std::move(loader));
@@ -1745,16 +1756,6 @@ void CascadiaSettings::_resolveNewTabMenuProfiles() const
     {
         remainingProfilesEntry.Profiles(remainingProfiles);
     }
-
-    // If the configuration does not have a "newTabMenu" field, GlobalAppSettings
-    // will return a default value containing just a "remainingProfiles" entry. However,
-    // this value is regenerated on every "get" operation, so the effect of setting
-    // the remaining profiles above will be undone. So only in the case that no custom
-    // value is present in GlobalAppSettings, we will store the modified default value.
-    if (!_globals->HasNewTabMenu())
-    {
-        _globals->NewTabMenu(entries);
-    }
 }
 
 // Method Description:

src/cascadia/TerminalSettingsModel/MTSMSettings.h

@@ -95,7 +95,7 @@ Author(s):
     X(Model::BellStyle, BellStyle, "bellStyle", BellStyle::Audible)                                                                                            \
     X(IEnvironmentVariableMap, EnvironmentVariables, "environment", nullptr)                                                                                   \
     X(bool, RightClickContextMenu, "rightClickContextMenu", false)                                                                                             \
-    X(Windows::Foundation::Collections::IVector<winrt::hstring>, BellSound, "bellSound", nullptr)                                                              \
+    X(Windows::Foundation::Collections::IVector<IMediaResource>, BellSound, "bellSound", nullptr)                                                              \
     X(bool, Elevate, "elevate", false)                                                                                                                         \
     X(bool, AutoMarkPrompts, "autoMarkPrompts", true)                                                                                                          \
     X(bool, ShowMarks, "showMarksOnScrollbar", false)                                                                                                          \

src/cascadia/TerminalSettingsModel/Profile.cpp

@@ -121,16 +121,10 @@ winrt::com_ptr<Profile> Profile::CopySettings() const
     MTSM_PROFILE_SETTINGS(PROFILE_SETTINGS_COPY)
 #undef PROFILE_SETTINGS_COPY
 
-    // BellSound is an IVector<hstring>, so we need to manually copy it over
     if (_BellSound)
     {
-        std::vector<hstring> sounds;
-        sounds.reserve(_BellSound->Size());
-        for (const auto& sound : *_BellSound)
-        {
-            sounds.emplace_back(sound);
-        }
-        profile->_BellSound = single_threaded_vector(std::move(sounds));
+        // BellSound is an IVector<>, so we need to make a new vector pointing at the same objects
+        profile->_BellSound = winrt::single_threaded_vector(wil::to_vector(*_BellSound));
     }
 
     if (_UnfocusedAppearance)
@@ -560,6 +554,16 @@ void Profile::ResolveMediaResources(const Model::MediaResourceResolver& resolver
     {
         container->ResolveMediaResources(resolver);
     }
+
+    if (const auto [bellSoundSource, bellSounds]{ _getBellSoundOverrideSourceAndValueImpl() };
+        bellSoundSource && bellSounds && *bellSounds && bellSounds->Size() > 0)
+    {
+        for (const auto& bellSound : *bellSounds)
+        {
+            ResolveMediaResource(bellSoundSource->_Origin, bellSoundSource->SourceBasePath, bellSound, resolver);
+        }
+        // It's important that we keep the invalid bell sounds in the list, because we may want to write it back out to disk
+    }
 }
 
 void Profile::LogSettingChanges(std::set<std::string>& changes, const std::string_view& context) const

src/cascadia/TerminalSettingsModel/Profile.idl

@@ -76,7 +76,7 @@ namespace Microsoft.Terminal.Settings.Model
 
         INHERITABLE_PROFILE_SETTING(Windows.Foundation.Collections.IMap<String COMMA String>, EnvironmentVariables);
 
-        INHERITABLE_PROFILE_SETTING(Windows.Foundation.Collections.IVector<String>, BellSound);
+        INHERITABLE_PROFILE_SETTING(Windows.Foundation.Collections.IVector<IMediaResource>, BellSound);
 
         INHERITABLE_PROFILE_SETTING(Boolean, Elevate);
         INHERITABLE_PROFILE_SETTING(Boolean, AutoMarkPrompts);

src/cascadia/TerminalSettingsModel/SshHostGenerator.cpp

@@ -35,19 +35,14 @@ using namespace winrt::Microsoft::Terminal::Settings::Model;
 
 /*static*/ const std::wregex SshHostGenerator::_configKeyValueRegex{ LR"(^\s*(\w+)\s+([^\s]+.*[^\s])\s*$)" };
 
-/*static*/ std::wstring_view SshHostGenerator::_getProfileName(const std::wstring_view& hostName) noexcept
+winrt::hstring _getProfileName(const std::wstring_view& hostName) noexcept
 {
-    return std::wstring_view{ L"" + PROFILE_TITLE_PREFIX + hostName };
+    return winrt::hstring{ fmt::format(FMT_COMPILE(L"{0}{1}"), PROFILE_TITLE_PREFIX, hostName) };
 }
 
-/*static*/ std::wstring_view SshHostGenerator::_getProfileIconPath() noexcept
+winrt::hstring _getProfileCommandLine(const std::wstring_view& sshExePath, const std::wstring_view& hostName) noexcept
 {
-    return PROFILE_ICON_PATH;
-}
-
-/*static*/ std::wstring_view SshHostGenerator::_getProfileCommandLine(const std::wstring_view& sshExePath, const std::wstring_view& hostName) noexcept
-{
-    return std::wstring_view{ L"\"" + sshExePath + L"\" " + hostName };
+    return winrt::hstring{ fmt::format(FMT_COMPILE(LR"("{0}" {1})"), sshExePath, hostName) };
 }
 
 /*static*/ bool SshHostGenerator::_tryFindSshExePath(std::wstring& sshExePath) noexcept
@@ -164,8 +159,8 @@ void SshHostGenerator::GenerateProfiles(std::vector<winrt::com_ptr<implementatio
         {
             const auto profile{ CreateDynamicProfile(_getProfileName(hostName)) };
 
-            profile->Commandline(winrt::hstring{ _getProfileCommandLine(sshExePath, hostName) });
-            profile->Icon(winrt::hstring{ _getProfileIconPath() });
+            profile->Commandline(_getProfileCommandLine(sshExePath, hostName));
+            profile->Icon(winrt::hstring{ PROFILE_ICON_PATH });
 
             profiles.emplace_back(profile);
         }

src/cascadia/TerminalSettingsModel/SshHostGenerator.h

@@ -31,10 +31,6 @@ namespace winrt::Microsoft::Terminal::Settings::Model
     private:
         static const std::wregex _configKeyValueRegex;
 
-        static std::wstring_view _getProfileName(const std::wstring_view& hostName) noexcept;
-        static std::wstring_view _getProfileIconPath() noexcept;
-        static std::wstring_view _getProfileCommandLine(const std::wstring_view& sshExePath, const std::wstring_view& hostName) noexcept;
-
         static bool _tryFindSshExePath(std::wstring& sshExePath) noexcept;
         static bool _tryParseConfigKeyValue(const std::wstring_view& line, std::wstring& key, std::wstring& value) noexcept;
         static void _getHostNamesFromConfigFile(const std::wstring_view& configPath, std::vector<std::wstring>& hostNames) noexcept;

src/cascadia/TerminalSettingsModel/VsDevCmdGenerator.h

@@ -26,12 +26,13 @@ namespace winrt::Microsoft::Terminal::Settings::Model
         void GenerateProfiles(const VsSetupConfiguration::VsSetupInstance& instance, bool hidden, std::vector<winrt::com_ptr<implementation::Profile>>& profiles) const override;
 
     private:
-        bool IsInstanceValid(const VsSetupConfiguration::VsSetupInstance&) const
+        bool IsInstanceValid(const VsSetupConfiguration::VsSetupInstance& instance) const
         {
             // We only support version of VS from 15.0.
             // Per heaths: The [ISetupConfiguration] COM server only supports Visual Studio 15.0 and newer anyway.
             // Eliding the version range will improve the discovery performance by not having to parse or compare the versions.
-            return true;
+            std::error_code ec;
+            return std::filesystem::exists(GetDevCmdScriptPath(instance), ec) && !ec;
         }
 
         std::wstring GetProfileGuidSeed(const VsSetupConfiguration::VsSetupInstance& instance) const

src/cascadia/TerminalSettingsModel/VsDevShellGenerator.h

@@ -28,7 +28,8 @@ namespace winrt::Microsoft::Terminal::Settings::Model
     private:
         bool IsInstanceValid(const VsSetupConfiguration::VsSetupInstance& instance) const
         {
-            return instance.VersionInRange(L"[16.2,)");
+            std::error_code ec;
+            return instance.VersionInRange(L"[16.2,)") && std::filesystem::exists(GetDevShellModulePath(instance), ec) && !ec;
         }
 
         std::wstring GetProfileGuidSeed(const VsSetupConfiguration::VsSetupInstance& instance) const

src/cascadia/TerminalSettingsModel/defaults.json

@@ -85,7 +85,7 @@
             "background": "#141414",
             "foreground": "#BAB7B6",
             "cursorColor": "#37E57B",
-            "selectionBackground": "#FFFFFF",
+            "selectionBackground": "#8DB8E5",
             "black": "#000000",
             "red": "#CF494C",
             "green": "#60B442",
@@ -101,7 +101,7 @@
             "brightBlue": "#688DFD",
             "brightPurple": "#ED6FE9",
             "brightCyan": "#32E0FB",
-            "brightWhite": "#D3D8D9"
+            "brightWhite": "#DEE3E4"
         },
         {
             "name": "Ottosson",

src/cascadia/UnitTests_Control/ControlInteractivityTests.cpp

@@ -170,7 +170,7 @@ namespace ControlUnitTests
 
             // The mouse location and buttons don't matter here.
             interactivity->MouseWheel(modifiers,
-                                      30,
+                                      Core::Point{ 0, 30 },
                                       Core::Point{ 0, 0 },
                                       buttonState);
         }
@@ -188,7 +188,7 @@ namespace ControlUnitTests
 
             // The mouse location and buttons don't matter here.
             interactivity->MouseWheel(modifiers,
-                                      -30,
+                                      Core::Point{ 0, -30 },
                                       Core::Point{ 0, 0 },
                                       buttonState);
         }
@@ -245,7 +245,7 @@ namespace ControlUnitTests
         expectedTop = 20;
 
         interactivity->MouseWheel(modifiers,
-                                  WHEEL_DELTA,
+                                  Core::Point{ 0, WHEEL_DELTA },
                                   Core::Point{ 0, 0 },
                                   buttonState);
 
@@ -254,18 +254,18 @@ namespace ControlUnitTests
         {
             expectedTop--;
             interactivity->MouseWheel(modifiers,
-                                      WHEEL_DELTA,
+                                      Core::Point{ 0, WHEEL_DELTA },
                                       Core::Point{ 0, 0 },
                                       buttonState);
         }
         Log::Comment(L"Scrolling up more should do nothing");
         expectedTop = 0;
         interactivity->MouseWheel(modifiers,
-                                  WHEEL_DELTA,
+                                  Core::Point{ 0, WHEEL_DELTA },
                                   Core::Point{ 0, 0 },
                                   buttonState);
         interactivity->MouseWheel(modifiers,
-                                  WHEEL_DELTA,
+                                  Core::Point{ 0, WHEEL_DELTA },
                                   Core::Point{ 0, 0 },
                                   buttonState);
 
@@ -275,7 +275,7 @@ namespace ControlUnitTests
             Log::Comment(NoThrowString().Format(L"---scroll down #%d---", i));
             expectedTop++;
             interactivity->MouseWheel(modifiers,
-                                      -WHEEL_DELTA,
+                                      Core::Point{ 0, -WHEEL_DELTA },
                                       Core::Point{ 0, 0 },
                                       buttonState);
             Log::Comment(NoThrowString().Format(L"internal scrollbar pos:%f", interactivity->_internalScrollbarPosition));
@@ -283,11 +283,11 @@ namespace ControlUnitTests
         Log::Comment(L"Scrolling down more should do nothing");
         expectedTop = 21;
         interactivity->MouseWheel(modifiers,
-                                  -WHEEL_DELTA,
+                                  Core::Point{ 0, -WHEEL_DELTA },
                                   Core::Point{ 0, 0 },
                                   buttonState);
         interactivity->MouseWheel(modifiers,
-                                  -WHEEL_DELTA,
+                                  Core::Point{ 0, -WHEEL_DELTA },
                                   Core::Point{ 0, 0 },
                                   buttonState);
     }
@@ -444,7 +444,7 @@ namespace ControlUnitTests
 
         Log::Comment(L"Scroll up a line, with the left mouse button selected");
         interactivity->MouseWheel(modifiers,
-                                  WHEEL_DELTA,
+                                  Core::Point{ 0, WHEEL_DELTA },
                                   cursorPosition1.to_core_point(),
                                   leftMouseDown);
 
@@ -492,55 +492,55 @@ namespace ControlUnitTests
         const Core::Point mousePos{ 0, 0 };
         Control::MouseButtonState state{};
 
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 1/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 1/5
         VERIFY_ARE_EQUAL(21, core->ScrollOffset());
 
         Log::Comment(L"Scroll up 4 more times. Once we're at 3/5 scrolls, "
                      L"we'll round the internal scrollbar position to scrolling to the next row.");
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 2/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 2/5
         VERIFY_ARE_EQUAL(21, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 3/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 3/5
         VERIFY_ARE_EQUAL(20, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 4/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 4/5
         VERIFY_ARE_EQUAL(20, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 5/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 5/5
         VERIFY_ARE_EQUAL(20, core->ScrollOffset());
 
         Log::Comment(L"Jump to line 5, so we can scroll down from there.");
         interactivity->UpdateScrollbar(5);
         VERIFY_ARE_EQUAL(5, core->ScrollOffset());
         Log::Comment(L"Scroll down 5 times, at which point we should accumulate a whole row of delta.");
-        interactivity->MouseWheel(modifiers, -delta, mousePos, state); // 1/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, -delta }, mousePos, state); // 1/5
         VERIFY_ARE_EQUAL(5, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, -delta, mousePos, state); // 2/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, -delta }, mousePos, state); // 2/5
         VERIFY_ARE_EQUAL(5, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, -delta, mousePos, state); // 3/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, -delta }, mousePos, state); // 3/5
         VERIFY_ARE_EQUAL(6, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, -delta, mousePos, state); // 4/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, -delta }, mousePos, state); // 4/5
         VERIFY_ARE_EQUAL(6, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, -delta, mousePos, state); // 5/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, -delta }, mousePos, state); // 5/5
         VERIFY_ARE_EQUAL(6, core->ScrollOffset());
 
         Log::Comment(L"Jump to the bottom.");
         interactivity->UpdateScrollbar(21);
         VERIFY_ARE_EQUAL(21, core->ScrollOffset());
         Log::Comment(L"Scroll a bit, then emit a line of text. We should reset our internal scroll position.");
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 1/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 1/5
         VERIFY_ARE_EQUAL(21, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 2/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 2/5
         VERIFY_ARE_EQUAL(21, core->ScrollOffset());
 
         conn->WriteInput(winrt_wstring_to_array_view(L"Foo\r\n"));
         VERIFY_ARE_EQUAL(22, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 1/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 1/5
         VERIFY_ARE_EQUAL(22, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 2/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 2/5
         VERIFY_ARE_EQUAL(22, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 3/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 3/5
         VERIFY_ARE_EQUAL(21, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 4/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 4/5
         VERIFY_ARE_EQUAL(21, core->ScrollOffset());
-        interactivity->MouseWheel(modifiers, delta, mousePos, state); // 5/5
+        interactivity->MouseWheel(modifiers, Core::Point{ 0, delta }, mousePos, state); // 5/5
         VERIFY_ARE_EQUAL(21, core->ScrollOffset());
     }
 
@@ -709,7 +709,7 @@ namespace ControlUnitTests
         {
             expectedTop--;
             interactivity->MouseWheel(modifiers,
-                                      WHEEL_DELTA,
+                                      Core::Point{ 0, WHEEL_DELTA },
                                       Core::Point{ 0, 0 },
                                       noMouseDown);
         }

src/cascadia/UnitTests_SettingsModel/MediaResourceTests.cpp

@@ -91,6 +91,7 @@ namespace SettingsModelUnitTests
         TEST_METHOD(ProfileInheritsInvalidIconAndHasNoCommandline);
         TEST_METHOD(ProfileSpecifiesNullIcon);
         TEST_METHOD(ProfileSpecifiesNullIconAndHasNoCommandline);
+        TEST_METHOD(ProfileOverwritesBellSound);
 
         // FRAGMENT BEHAVIORS
         TEST_METHOD(FragmentUpdatesBaseProfile);
@@ -125,7 +126,11 @@ namespace SettingsModelUnitTests
                 "backgroundImage": "imagePathFromBase",
                 "guid": "{862d46aa-cc9c-4e6c-b872-9cadaafcdbbe}",
                 "icon": "iconFromBase",
-                "name": "Base"
+                "name": "Base",
+                "bellSound": [
+                    "C:\\Windows\\Media\\Alarm01.wav",
+                    "C:\\Windows\\Media\\Alarm02.wav"
+                ]
             },
             {
                 "backgroundImage": "focusedImagePathFromBase",
@@ -167,7 +172,7 @@ namespace SettingsModelUnitTests
     ]
 })" };
 
-        static constexpr int numberOfMediaResourcesInDefaultSettings{ 9 };
+        static constexpr int numberOfMediaResourcesInDefaultSettings{ 11 };
 
         struct Fragment
         {
@@ -1021,6 +1026,37 @@ namespace SettingsModelUnitTests
         VERIFY_IS_TRUE(icon.Ok()); // Profile with commandline always has an icon
         VERIFY_ARE_EQUAL(cmdCommandline, icon.Resolved());
     }
+
+    // A profile replaces the bell sounds (2) in the base settings; all bell sounds retained
+    void MediaResourceTests::ProfileOverwritesBellSound()
+    {
+        WEX::TestExecution::DisableVerifyExceptions disableVerifyExceptions{};
+        winrt::com_ptr<implementation::CascadiaSettings> settings;
+        {
+            auto [t, e] = requireCalled([&](auto&&, auto&&, auto&& resource) {
+                // All resources are invalid.
+                resource.Reject();
+            });
+            g_mediaResolverHook = t;
+            settings = createSettings(R"({
+    "profiles": {
+        "list": [
+            {
+                "guid": "{862d46aa-cc9c-4e6c-b872-9cadaafcdbbe}",
+                "bellSound": [
+                    "does not matter; resolved rejected"
+                ],
+            },
+        ]
+    }
+})");
+        }
+
+        auto profile{ settings->GetProfileByName(L"Base") };
+        auto bellSounds{ profile.BellSound() };
+        VERIFY_ARE_EQUAL(1u, bellSounds.Size());
+        VERIFY_IS_FALSE(bellSounds.GetAt(0).Ok());
+    }
 #pragma endregion
 
 #pragma region Real Resolver Tests

src/cascadia/WindowsTerminal/AppHost.cpp

@@ -745,7 +745,7 @@ void AppHost::_RaiseVisualBell(const winrt::Windows::Foundation::IInspectable&,
 // - delta: the wheel delta that triggered this event.
 // Return Value:
 // - <none>
-void AppHost::_WindowMouseWheeled(const winrt::Windows::Foundation::Point coord, const int32_t delta)
+void AppHost::_WindowMouseWheeled(const winrt::Windows::Foundation::Point coord, const winrt::Microsoft::Terminal::Core::Point delta)
 {
     if (_windowLogic)
     {

src/cascadia/WindowsTerminal/AppHost.h

@@ -73,7 +73,7 @@ private:
 
     void _RaiseVisualBell(const winrt::Windows::Foundation::IInspectable& sender,
                           const winrt::Windows::Foundation::IInspectable& arg);
-    void _WindowMouseWheeled(const winrt::Windows::Foundation::Point coord, const int32_t delta);
+    void _WindowMouseWheeled(const winrt::Windows::Foundation::Point coord, const winrt::Microsoft::Terminal::Core::Point delta);
     void _WindowActivated(bool activated);
     void _WindowMoved();
 

src/cascadia/WindowsTerminal/IslandWindow.cpp

@@ -595,6 +595,7 @@ void IslandWindow::_OnGetMinMaxInfo(const WPARAM /*wParam*/, const LPARAM lParam
         WindowCloseButtonClicked.raise();
         return 0;
     }
+    case WM_MOUSEHWHEEL:
     case WM_MOUSEWHEEL:
         try
         {
@@ -623,7 +624,11 @@ void IslandWindow::_OnGetMinMaxInfo(const WPARAM /*wParam*/, const LPARAM lParam
             const auto scale = GetCurrentDpiScale();
             const winrt::Windows::Foundation::Point real{ relative.x / scale, relative.y / scale };
 
-            const auto wheelDelta = static_cast<short>(HIWORD(wparam));
+            winrt::Microsoft::Terminal::Core::Point wheelDelta{ 0, static_cast<int32_t>(HIWORD(wparam)) };
+            if (message == WM_MOUSEHWHEEL)
+            {
+                std::swap(wheelDelta.X, wheelDelta.Y);
+            }
 
             // Raise an event, so any listeners can handle the mouse wheel event manually.
             MouseScrolled.raise(real, wheelDelta);

src/cascadia/WindowsTerminal/IslandWindow.h

@@ -74,7 +74,7 @@ public:
 
     til::event<winrt::delegate<>> DragRegionClicked;
     til::event<winrt::delegate<>> WindowCloseButtonClicked;
-    til::event<winrt::delegate<void(winrt::Windows::Foundation::Point, int32_t)>> MouseScrolled;
+    til::event<winrt::delegate<void(winrt::Windows::Foundation::Point, winrt::Microsoft::Terminal::Core::Point)>> MouseScrolled;
     til::event<winrt::delegate<void(bool)>> WindowActivated;
     til::event<winrt::delegate<void()>> NotifyNotificationIconPressed;
     til::event<winrt::delegate<void()>> NotifyWindowHidden;

src/cascadia/WindowsTerminal/WindowEmperor.cpp

@@ -253,6 +253,29 @@ void WindowEmperor::CreateNewWindow(winrt::TerminalApp::WindowRequestedArgs args
 
     _windowCount += 1;
     _windows.emplace_back(std::move(host));
+
+    if (_windowCount == 1)
+    {
+        // The first CoreWindow is created implicitly by XAML and parented to the
+        // first XAML island. We parent it to our initial window for 2 reasons:
+        // * On Windows 10 the CoreWindow will show up as a visible window on the taskbar
+        //   due to a WinUI bug, and this will hide it, because our initial window is hidden.
+        // * When we DestroyWindow() the island it will destroy the CoreWindow,
+        //   and it's not possible to recreate it. That's also a WinUI bug.
+        //
+        // Note that this must be done after the first window (= first island) is created.
+        if (const auto coreWindow = winrt::Windows::UI::Core::CoreWindow::GetForCurrentThread())
+        {
+            if (const auto interop = coreWindow.try_as<ICoreWindowInterop>())
+            {
+                HWND coreHandle = nullptr;
+                if (SUCCEEDED(interop->get_WindowHandle(&coreHandle)) && coreHandle)
+                {
+                    SetParent(coreHandle, _window.get());
+                }
+            }
+        }
+    }
 }
 
 AppHost* WindowEmperor::_mostRecentWindow() const noexcept
@@ -395,24 +418,6 @@ void WindowEmperor::HandleCommandlineArgs(int nCmdShow)
         LOG_IF_WIN32_BOOL_FALSE(SetCurrentDirectoryW(system32.c_str()));
     }
 
-    // The first CoreWindow is created implicitly by XAML and parented to the
-    // first XAML island. We parent it to our initial window for 2 reasons:
-    // * On Windows 10 the CoreWindow will show up as a visible window on the taskbar
-    //   due to a WinUI bug, and this will hide it, because our initial window is hidden.
-    // * When we DestroyWindow() the island it will destroy the CoreWindow,
-    //   and it's not possible to recreate it. That's also a WinUI bug.
-    if (const auto coreWindow = winrt::Windows::UI::Core::CoreWindow::GetForCurrentThread())
-    {
-        if (const auto interop = coreWindow.try_as<ICoreWindowInterop>())
-        {
-            HWND coreHandle = nullptr;
-            if (SUCCEEDED(interop->get_WindowHandle(&coreHandle)) && coreHandle)
-            {
-                SetParent(coreHandle, _window.get());
-            }
-        }
-    }
-
     {
         TerminalConnection::ConptyConnection::NewConnection([this](TerminalConnection::ConptyConnection conn) {
             TerminalApp::CommandlineArgs args;
@@ -544,6 +549,8 @@ void WindowEmperor::_dispatchSpecialKey(const MSG& msg) const
 
 void WindowEmperor::_dispatchCommandline(winrt::TerminalApp::CommandlineArgs args)
 {
+    _assertIsMainThread();
+
     const auto exitCode = args.ExitCode();
 
     if (const auto msg = args.ExitMessage(); !msg.empty())
@@ -681,6 +688,8 @@ safe_void_coroutine WindowEmperor::_dispatchCommandlineCurrentDesktop(winrt::Ter
 
 bool WindowEmperor::_summonWindow(const SummonWindowSelectionArgs& args) const
 {
+    _assertIsMainThread();
+
     AppHost* window = nullptr;
 
     if (args.WindowID)
@@ -721,6 +730,8 @@ bool WindowEmperor::_summonWindow(const SummonWindowSelectionArgs& args) const
 
 void WindowEmperor::_summonAllWindows() const
 {
+    _assertIsMainThread();
+
     TerminalApp::SummonWindowBehavior args;
     args.ToggleVisibility(false);
 
@@ -858,6 +869,9 @@ LRESULT WindowEmperor::_messageHandler(HWND window, UINT const message, WPARAM c
                 // Did the window counter get out of sync? It shouldn't.
                 assert(_windowCount == gsl::narrow_cast<int32_t>(_windows.size()));
 
+                // !!! NOTE !!!
+                // At least theoretically the lParam pointer may be invalid.
+                // We should only access it if we find it in our _windows array.
                 const auto host = reinterpret_cast<AppHost*>(lParam);
                 auto it = _windows.begin();
                 const auto end = _windows.end();
@@ -866,7 +880,15 @@ LRESULT WindowEmperor::_messageHandler(HWND window, UINT const message, WPARAM c
                 {
                     if (host == it->get())
                     {
-                        host->Close();
+                        // NOTE: The AppHost destructor is highly non-trivial.
+                        //
+                        // It _may_ call into XAML, which _may_ pump the message loop, which would then recursively
+                        // re-enter this function, which _may_ then handle another WM_CLOSE_TERMINAL_WINDOW,
+                        // which would change the _windows array, and invalidate our iterator and crash.
+                        //
+                        // We can prevent this by deferring destruction until after the erase() call.
+                        const auto strong = *it;
+                        strong->Close();
                         _windows.erase(it);
                         break;
                     }

src/cascadia/WindowsTerminal/WindowEmperor.h

@@ -84,14 +84,14 @@ private:
     int32_t _windowCount = 0;
     int32_t _messageBoxCount = 0;
 
-#ifdef NDEBUG
+#if 0 // #ifdef NDEBUG
     static constexpr void _assertIsMainThread() noexcept
     {
     }
 #else
     void _assertIsMainThread() const noexcept
     {
-        assert(_mainThreadId == GetCurrentThreadId());
+        WI_ASSERT_MSG(_mainThreadId == GetCurrentThreadId(), "This part of WindowEmperor must be accessed from the UI thread");
     }
     DWORD _mainThreadId = GetCurrentThreadId();
 #endif

src/host/screenInfo.cpp

@@ -1718,6 +1718,19 @@ void SCREEN_INFORMATION::SnapOnInput(const WORD vkey)
     }
 }
 
+SCREEN_INFORMATION::SnapOnScopeExit SCREEN_INFORMATION::SnapOnOutput() noexcept
+{
+    const auto call =
+        // We don't need to snap-on-output the alt buffer since it doesn't scroll anyway.
+        // More importantly though, in the current architecture the alt buffer gets deallocated
+        // the second we receive a \033[?1049l, which makes our this pointer hazardous to use.
+        _psiMainBuffer == nullptr &&
+        // We only want to snap if the user didn't intentionally scroll away.
+        // The snapping logic could be improved, but it's alright for now.
+        _viewport.IsInBounds(_textBuffer->GetCursor().GetPosition());
+    return SnapOnScopeExit{ call ? this : nullptr };
+}
+
 void SCREEN_INFORMATION::_makeCursorVisible()
 {
     if (_textBuffer->GetCursor().IsVisible())

src/host/screenInfo.hpp

@@ -50,6 +50,25 @@ class ConversionAreaInfo; // forward decl window. circular reference
 class SCREEN_INFORMATION : public ConsoleObjectHeader, public Microsoft::Console::IIoProvider
 {
 public:
+    // This little helper works like wil::scope_exit but is slimmer
+    // (= easier to optimize) and has a concrete type (= can declare).
+    struct SnapOnScopeExit
+    {
+        ~SnapOnScopeExit()
+        {
+            if (self)
+            {
+                try
+                {
+                    self->_makeCursorVisible();
+                }
+                CATCH_LOG();
+            }
+        }
+
+        SCREEN_INFORMATION* self;
+    };
+
     [[nodiscard]] static NTSTATUS CreateInstance(_In_ til::size coordWindowSize,
                                                  const FontInfo fontInfo,
                                                  _In_ til::size coordScreenBufferSize,
@@ -73,16 +92,7 @@ public:
     void MakeCurrentCursorVisible();
     void MakeCursorVisible(til::point position);
     void SnapOnInput(WORD vkey);
-    auto SnapOnOutput() noexcept
-    {
-        const auto inBounds = _viewport.IsInBounds(_textBuffer->GetCursor().GetPosition());
-        return wil::scope_exit([this, inBounds]() {
-            if (inBounds)
-            {
-                _makeCursorVisible();
-            }
-        });
-    }
+    SnapOnScopeExit SnapOnOutput() noexcept;
 
     void ClipToScreenBuffer(_Inout_ til::inclusive_rect* const psrClip) const;
 

src/interactivity/win32/windowio.cpp

@@ -567,7 +567,7 @@ BOOL HandleMouseEvent(const SCREEN_INFORMATION& ScreenInfo,
     if (!fShiftPressed && !pSelection->IsInSelectingState())
     {
         short sDelta = 0;
-        if (Message == WM_MOUSEWHEEL)
+        if (Message == WM_MOUSEWHEEL || Message == WM_MOUSEHWHEEL)
         {
             sDelta = GET_WHEEL_DELTA_WPARAM(wParam);
         }

src/terminal/adapter/ut_adapter/MouseInputTest.cpp

@@ -127,10 +127,13 @@ public:
             wch = L'!';
             break;
         case WM_MOUSEWHEEL:
-        case WM_MOUSEHWHEEL:
             Log::Comment(NoThrowString().Format(L"MOUSEWHEEL"));
             wch = L'`' + (sScrollDelta > 0 ? 0 : 1);
             break;
+        case WM_MOUSEHWHEEL:
+            Log::Comment(NoThrowString().Format(L"MOUSEHWHEEL"));
+            wch = L'b' + (sScrollDelta > 0 ? 1 : 0);
+            break;
         case WM_MOUSEMOVE:
         default:
             Log::Comment(NoThrowString().Format(L"DEFAULT"));
@@ -168,9 +171,11 @@ public:
             result = 3 + 0x20; // we add 0x20 to hover events, which are all encoded as WM_MOUSEMOVE events
             break;
         case WM_MOUSEWHEEL:
-        case WM_MOUSEHWHEEL:
             result = (sScrollDelta > 0 ? 64 : 65);
             break;
+        case WM_MOUSEHWHEEL:
+            result = (sScrollDelta > 0 ? 67 : 66);
+            break;
         default:
             result = 0;
             break;
@@ -582,6 +587,12 @@ public:
         Log::Comment(L"Test mouse wheel scrolling down");
         VERIFY_ARE_EQUAL(TerminalInput::MakeOutput(L"\x1B[B"), mouseInput.HandleMouse({ 0, 0 }, WM_MOUSEWHEEL, noModifierKeys, -WHEEL_DELTA, {}));
 
+        Log::Comment(L"Test mouse wheel scrolling right");
+        VERIFY_ARE_EQUAL(TerminalInput::MakeOutput(L"\x1B[C"), mouseInput.HandleMouse({ 0, 0 }, WM_MOUSEHWHEEL, noModifierKeys, WHEEL_DELTA, {}));
+
+        Log::Comment(L"Test mouse wheel scrolling left");
+        VERIFY_ARE_EQUAL(TerminalInput::MakeOutput(L"\x1B[D"), mouseInput.HandleMouse({ 0, 0 }, WM_MOUSEHWHEEL, noModifierKeys, -WHEEL_DELTA, {}));
+
         Log::Comment(L"Enable cursor keys mode");
         mouseInput.SetInputMode(TerminalInput::Mode::CursorKey, true);
 
@@ -591,6 +602,12 @@ public:
         Log::Comment(L"Test mouse wheel scrolling down");
         VERIFY_ARE_EQUAL(TerminalInput::MakeOutput(L"\x1BOB"), mouseInput.HandleMouse({ 0, 0 }, WM_MOUSEWHEEL, noModifierKeys, -WHEEL_DELTA, {}));
 
+        Log::Comment(L"Test mouse wheel scrolling right");
+        VERIFY_ARE_EQUAL(TerminalInput::MakeOutput(L"\x1BOC"), mouseInput.HandleMouse({ 0, 0 }, WM_MOUSEHWHEEL, noModifierKeys, WHEEL_DELTA, {}));
+
+        Log::Comment(L"Test mouse wheel scrolling left");
+        VERIFY_ARE_EQUAL(TerminalInput::MakeOutput(L"\x1BOD"), mouseInput.HandleMouse({ 0, 0 }, WM_MOUSEHWHEEL, noModifierKeys, -WHEEL_DELTA, {}));
+
         Log::Comment(L"Confirm no effect when scroll mode is disabled");
         mouseInput.UseAlternateScreenBuffer();
         mouseInput.SetInputMode(TerminalInput::Mode::AlternateScroll, false);

src/terminal/input/mouseInput.cpp

@@ -163,9 +163,11 @@ static constexpr wchar_t _windowsButtonToXEncoding(const unsigned int button,
         xvalue = 1;
         break;
     case WM_MOUSEWHEEL:
-    case WM_MOUSEHWHEEL:
         xvalue = delta > 0 ? 0x40 : 0x41;
         break;
+    case WM_MOUSEHWHEEL:
+        xvalue = delta > 0 ? 0x43 : 0x42;
+        break;
     default:
         xvalue = 0;
         break;
@@ -221,9 +223,11 @@ static constexpr int _windowsButtonToSGREncoding(const unsigned int button,
         xvalue = 3;
         break;
     case WM_MOUSEWHEEL:
-    case WM_MOUSEHWHEEL:
         xvalue = delta > 0 ? 0x40 : 0x41;
         break;
+    case WM_MOUSEHWHEEL:
+        xvalue = delta > 0 ? 0x43 : 0x42;
+        break;
     default:
         xvalue = 0;
         break;
@@ -378,7 +382,7 @@ TerminalInput::OutputType TerminalInput::HandleMouse(const til::point position,
 
     if (ShouldSendAlternateScroll(button, delta))
     {
-        return _makeAlternateScrollOutput(delta);
+        return _makeAlternateScrollOutput(button, delta);
     }
 
     return {};
@@ -493,14 +497,32 @@ bool TerminalInput::ShouldSendAlternateScroll(const unsigned int button, const s
 // - Sends a sequence to the input corresponding to cursor up / down depending on the sScrollDelta.
 // Parameters:
 // - delta: The scroll wheel delta of the input event
-TerminalInput::OutputType TerminalInput::_makeAlternateScrollOutput(const short delta) const
+TerminalInput::OutputType TerminalInput::_makeAlternateScrollOutput(const unsigned int button, const short delta) const
 {
-    if (delta > 0)
+    if (button == WM_MOUSEWHEEL)
     {
-        return MakeOutput(_keyMap.at(VK_UP));
+        if (delta > 0)
+        {
+            return MakeOutput(_keyMap.at(VK_UP));
+        }
+        else
+        {
+            return MakeOutput(_keyMap.at(VK_DOWN));
+        }
+    }
+    else if (button == WM_MOUSEHWHEEL)
+    {
+        if (delta > 0)
+        {
+            return MakeOutput(_keyMap.at(VK_RIGHT));
+        }
+        else
+        {
+            return MakeOutput(_keyMap.at(VK_LEFT));
+        }
     }
     else
     {
-        return MakeOutput(_keyMap.at(VK_DOWN));
+        return {};
     }
 }

src/terminal/input/terminalInput.hpp

@@ -111,7 +111,7 @@ namespace Microsoft::Console::VirtualTerminal
         [[nodiscard]] OutputType _GenerateUtf8Sequence(til::point position, unsigned int button, bool isHover, short modifierKeyState, short delta);
         [[nodiscard]] OutputType _GenerateSGRSequence(til::point position, unsigned int button, bool isRelease, bool isHover, short modifierKeyState, short delta);
 
-        [[nodiscard]] OutputType _makeAlternateScrollOutput(short delta) const;
+        [[nodiscard]] OutputType _makeAlternateScrollOutput(unsigned int button, short delta) const;
 
         static constexpr unsigned int s_GetPressedButton(const MouseButtonState state) noexcept;
 #pragma endregion

src/terminal/parser/InputStateMachineEngine.cpp

@@ -897,6 +897,22 @@ bool InputStateMachineEngine::_UpdateSGRMouseButtonState(const VTID id,
         eventFlags |= MOUSE_WHEELED;
         break;
     }
+    case CsiMouseButtonCodes::ScrollLeft:
+    {
+        // set high word to proper scroll direction
+        // scroll intensity is assumed to be constant value
+        buttonState |= SCROLL_DELTA_BACKWARD;
+        eventFlags |= MOUSE_HWHEELED;
+        break;
+    }
+    case CsiMouseButtonCodes::ScrollRight:
+    {
+        // set high word to proper scroll direction
+        // scroll intensity is assumed to be constant value
+        buttonState |= SCROLL_DELTA_FORWARD;
+        eventFlags |= MOUSE_HWHEELED;
+        break;
+    }
     case CsiMouseButtonCodes::Released:
         // hover event, we still want to send these but we don't
         // need to do anything special here, so just break

src/terminal/parser/InputStateMachineEngine.hpp

@@ -111,6 +111,8 @@ namespace Microsoft::Console::VirtualTerminal
         Released = 3,
         ScrollForward = 4,
         ScrollBack = 5,
+        ScrollLeft = 6,
+        ScrollRight = 7,
     };
 
     constexpr unsigned short CsiMouseModifierCode_Drag = 32;

src/terminal/parser/ut_parser/InputEngineTest.cpp

@@ -1194,8 +1194,10 @@ void InputEngineTest::SGRMouseTest_Scroll()
     // NOTE: scrolling events do NOT send a mouse up event
     const std::vector<std::tuple<SGR_PARAMS, MOUSE_EVENT_PARAMS>> testData = {
         //  TEST INPUT                                                                             EXPECTED OUTPUT
-        {   { CsiMouseButtonCodes::ScrollForward, 0, { 1, 1 }, CsiActionCodes::MouseDown },        { SCROLL_DELTA_FORWARD,  0, { 0, 0 }, MOUSE_WHEELED } },
-        {   { CsiMouseButtonCodes::ScrollBack,    0, { 1, 1 }, CsiActionCodes::MouseDown },        { SCROLL_DELTA_BACKWARD, 0, { 0, 0 }, MOUSE_WHEELED } },
+        {   { CsiMouseButtonCodes::ScrollForward, 0, { 1, 1 }, CsiActionCodes::MouseDown },        { SCROLL_DELTA_FORWARD,  0, { 0, 0 }, MOUSE_WHEELED  } },
+        {   { CsiMouseButtonCodes::ScrollBack,    0, { 1, 1 }, CsiActionCodes::MouseDown },        { SCROLL_DELTA_BACKWARD, 0, { 0, 0 }, MOUSE_WHEELED  } },
+        {   { CsiMouseButtonCodes::ScrollLeft,    0, { 1, 1 }, CsiActionCodes::MouseDown },        { SCROLL_DELTA_BACKWARD, 0, { 0, 0 }, MOUSE_HWHEELED } },
+        {   { CsiMouseButtonCodes::ScrollRight,   0, { 1, 1 }, CsiActionCodes::MouseDown },        { SCROLL_DELTA_FORWARD,  0, { 0, 0 }, MOUSE_HWHEELED } },
     };
     // clang-format on
     VerifySGRMouseData(testData);