starred/terminal
1
0
Fork 0
mirror of https://github.com/microsoft/terminal.git synced 2026-02-04 05:35:20 +00:00
Code Issues 19.0k Packages Projects Releases 20 Wiki Activity

Cursor invalidation failing when line renditions are used #21666

New Issue
Open
opened 2026-01-31 07:51:27 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 07:51:27 +00:00
Owner
Copy Link

Originally created by @j4james on GitHub (May 9, 2024).

Windows Terminal version

1.21.1272.0

Windows build number

10.0.19045.4291

Other Software

No response

Steps to reproduce

  1. Open a WSL bash shell
  2. Execute the following statement: 
    printf "\ec\e[999B\n\e[H\e#6\n\e[1 q"; read
  3. Type some text and note whether the cursor is blinking.
  4. Backspace to the start of the line and check the cursor again.

Expected Behavior

The final escape sequence in that printf is a DECSCUSR command, setting the cursor style to a blinking block, so it should be blinking the whole time (except maybe when it's actually moving).

Actual Behavior

The cursor blinks at the start of the line, but doesn't blink in any other column. The issue isn't specifically related to blinking, though. It can also manifest as almost constant cursor "droppings", but this test case was the easiest to reproduce.

And note that it also fails on openconsole/conhost if you've configured it to use the Atlas engine, so it's not a conpty issue, but it appears to be Atlas only.

Line rendition has got something to do with it - the first line is set to double-width in this test - but it's not only the double-width line that is affected. And I think the scroll offset is also a factor, which is why this test case forces a linefeed at the bottom of the page.

As far as I can tell from a git bisect, it first broke in commit 20b0bed46d (PR #15500).

Originally created by @j4james on GitHub (May 9, 2024). ### Windows Terminal version 1.21.1272.0 ### Windows build number 10.0.19045.4291 ### Other Software _No response_ ### Steps to reproduce 1. Open a WSL bash shell 2. Execute the following statement: ``` printf "\ec\e[999B\n\e[H\e#6\n\e[1 q"; read ``` 3. Type some text and note whether the cursor is blinking. 4. Backspace to the start of the line and check the cursor again. ### Expected Behavior The final escape sequence in that `printf` is a `DECSCUSR` command, setting the cursor style to a blinking block, so it should be blinking the whole time (except maybe when it's actually moving). ### Actual Behavior The cursor blinks at the start of the line, but doesn't blink in any other column. The issue isn't specifically related to blinking, though. It can also manifest as almost constant cursor "droppings", but this test case was the easiest to reproduce. And note that it also fails on openconsole/conhost if you've configured it to use the Atlas engine, so it's not a conpty issue, but it appears to be Atlas only. Line rendition has got something to do with it - the first line is set to double-width in this test - but it's not only the double-width line that is affected. And I think the scroll offset is also a factor, which is why this test case forces a linefeed at the bottom of the page. As far as I can tell from a git bisect, it first broke in commit 20b0bed46df71c596b4fb68edfb6bb4b4ebf1c89 (PR #15500).
claunia added the Needs-TriageIssue-Bug labels 2026-01-31 07:51:27 +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 Issue-Bug Needs-Triage
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#21666
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?