[ainulindale] Clean tear down the App when the process exits

src/cascadia/WindowsTerminal/WindowEmperor.cpp

@@ -30,6 +30,12 @@ WindowEmperor::WindowEmperor() noexcept :
     });
 }
 
+WindowEmperor::~WindowEmperor()
+{
+    _app.Close();
+    _app = nullptr;
+}
+
 void _buildArgsFromCommandline(std::vector<winrt::hstring>& args)
 {
     if (auto commandline{ GetCommandLineW() })

src/cascadia/WindowsTerminal/WindowEmperor.h

@@ -19,6 +19,7 @@ class WindowEmperor
 {
 public:
     WindowEmperor() noexcept;
+    ~WindowEmperor();
     bool ShouldExit();
     void WaitForWindows();