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[PR #18864] Fix SGR mouse movement reports #31631

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opened 2026-01-31 09:48:31 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:48:31 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/18864

State: closed
Merged: Yes

According to the documentation, the final character of an SGR mouse
report is meant to be M for a button press and m for a button
release. However it isn't clear what the final character should be for
motion events, and we were using an m if there weren't any buttons
held down at the time, while all other terminals used an M, regardless
of the button state.

This PR updates our implementation to match what everyone else is doing,
since our interpretation of the spec was causing problems for some apps.

Validation Steps Performed

I've manually tested the new behavior in Vttest, and confirmed that our
mouse reports now match Xterm more closely, and I've tested with v0.42.0
of Zellij, which was previous glitching badly in Windows Terminal, but
now works correctly.

I've also updated our unit tests for the SGR mouse mode to reflect the
correct report format.

Closes #18712

**Original Pull Request:** https://github.com/microsoft/terminal/pull/18864 **State:** closed **Merged:** Yes --- According to the documentation, the final character of an SGR mouse report is meant to be `M` for a button press and `m` for a button release. However it isn't clear what the final character should be for motion events, and we were using an `m` if there weren't any buttons held down at the time, while all other terminals used an `M`, regardless of the button state. This PR updates our implementation to match what everyone else is doing, since our interpretation of the spec was causing problems for some apps. ## Validation Steps Performed I've manually tested the new behavior in Vttest, and confirmed that our mouse reports now match Xterm more closely, and I've tested with v0.42.0 of Zellij, which was previous glitching badly in Windows Terminal, but now works correctly. I've also updated our unit tests for the SGR mouse mode to reflect the correct report format. Closes #18712
claunia added the pull-request label 2026-01-31 09:48:31 +00:00
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Reference: starred/terminal#31631
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