starred/terminal
1
0
Fork 0
mirror of https://github.com/microsoft/terminal.git synced 2026-02-03 21:25:34 +00:00
Code Issues 19.0k Packages Projects Releases 20 Wiki Activity

[PR #16793] Properly fix ConPTY buffer corking #30997

New Issue
Open
opened 2026-01-31 09:44:27 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:44:27 +00:00
Owner
Copy Link

Original Pull Request: https://github.com/microsoft/terminal/pull/16793

State: closed
Merged: Yes

I've found that #16079 was never properly addressed (it still randomly
occurred after even after PR #16349), which later led to the issues
described in #16769 (nushell flickering due to too many flushes).

The crux of the fix is that this brings back the _noFlushOnEnd flag
that was removed in PR #15991. This is then combined with a change to
the cork API: An uncork on VtEngine now only flushes if _Flush
got called while it was corked in the first place.

_noFlushOnEnd prevents us from flushing in between two "unknown"
VT sequences (like soft fonts or FTCS) which prevents them from being
corrupted. The corking prevents the remaining cases of flushing too
often. Long-term, a proper fix would be to pass through VT unmodified.

Closes #16769

**Original Pull Request:** https://github.com/microsoft/terminal/pull/16793 **State:** closed **Merged:** Yes --- I've found that #16079 was never properly addressed (it still randomly occurred after even after PR #16349), which later led to the issues described in #16769 (nushell flickering due to too many flushes). The crux of the fix is that this brings back the `_noFlushOnEnd` flag that was removed in PR #15991. This is then combined with a change to the cork API: An `uncork` on `VtEngine` now only flushes if `_Flush` got called while it was corked in the first place. `_noFlushOnEnd` prevents us from flushing in between two "unknown" VT sequences (like soft fonts or FTCS) which prevents them from being corrupted. The corking prevents the remaining cases of flushing too often. Long-term, a proper fix would be to pass through VT unmodified. Closes #16769
claunia added the pull-request label 2026-01-31 09:44:27 +00:00
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
⛺ Reserved
A11yCO
A11yMAS
A11ySev1
A11ySev2
A11ySev3
A11yTTValidated
A11yUsable
A11yVoiceAccess
A11yWCAG
Area-Accessibility
Area-AtlasEngine
Area-AzureShell
Area-Build
Area-Build
Area-Chat
Area-CmdPal
Area-CodeHealth
Area-Commandline
Area-CookedRead
Area-DefApp
Area-Extensibility
Area-Fonts
Area-GroupPolicy
Area-i18n
Area-Input
Area-Interaction
Area-Interop
Area-Localization
Area-Output
Area-Performance
Area-Portable
Area-Quality
Area-Remoting
Area-Rendering
Area-Schema
Area-Server
Area-Settings
Area-SettingsUI
Area-ShellExtension
Area-ShellExtension
Area-ShellExtension
Area-Suggestions
Area-Suggestions
Area-TerminalConnection
Area-TerminalControl
Area-Theming
Area-UserInterface
Area-VT
Area-Windowing
Area-WPFControl
AutoMerge
Blocking-Ingestion
Culprit-Centennial
Culprit-WinUI
Disability-All
Disability-Blind
Disability-LowVision
Disability-Mobility
External-Blocked-WinUI3
Fixed
Gathering-Data
good first issue
HCL-E+D
HCL-WindowsTerminal
Help Wanted
Impact-Compatibility
Impact-Compliance
Impact-Correctness
Impact-Visual
In-PR
InclusionBacklog
InclusionBacklog-Windows TerminalWin32
InclusionCommitted-202206
Issue-Bug
Issue-Docs
Issue-Feature
Issue-Feature
Issue-Question
Issue-Samples
Issue-Scenario
Issue-Task
Needs-Attention
Needs-Author-Feedback
Needs-Bisect
Needs-Discussion
Needs-Repro
Needs-Tag-Fix
Needs-Tag-Fix
Needs-Triage
No-Recent-Activity
Priority-0
Priority-1
Priority-2
Priority-3
Product-Cmd.exe
Product-Colortool
Product-Colortool
Product-Colortool
Product-Conhost
Product-Conpty
Product-Meta
Product-Powershell
Product-Terminal
Product-WSL
pull-request
Mirrored from GitHub Pull Request
 Resolution-Answered
Resolution-By-Design
Resolution-Duplicate
Resolution-External
Resolution-Fix-Available
Resolution-Fix-Committed
Resolution-No-Repro
Resolution-Won't-Fix
Severity-Blocking
Severity-Crash
Severity-DataLoss
spam
this-will-be-a-breaking-change
Tracking-External
WindowsTerminal_Win32
Work-Item
zAskModeBug
zInbox-Bug
No Label pull-request
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
claunia
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: starred/terminal#30997
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?