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SM ? 25h by conhost is paired wrongly with a SM 25 l (missing ?) #14733

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opened 2026-01-31 04:18:03 +00:00 by claunia · 6 comments
claunia commented 2026-01-31 04:18:03 +00:00
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Originally created by @christianparpart on GitHub (Jul 30, 2021).

Windows Terminal version (or Windows build number)

1.9.1942.0

Other Software

while trying to debug my own terminal emulator i noticed that conhost sends me SM 25 l, which is missing the ? questionmark if it was meant to the the invert of SM ? 25 h.

See https://vt100.net/docs/vt510-rm/DECRQM.html#T5-8

ANSI SM does not even have a mode 25 (IIRC) but
DECSM does have, which shows/hides the cursor. I think that was the intend here.

Steps to reproduce

oh that's hard to tell ya. I don't want to get you to compile my project, but I am pretty sure it is findable without that. Maybe just be looking at what VT sequences conhost generates (SM 25 l vs SM ? 25 h)?

Expected Behavior

SM ? 25 h is paired with SM ? 25 l :)

Actual Behavior

no question mark :)

Originally created by @christianparpart on GitHub (Jul 30, 2021). ### Windows Terminal version (or Windows build number) 1.9.1942.0 ### Other Software while trying to debug my own terminal emulator i noticed that conhost sends me `SM 25 l`, which is missing the `?` questionmark if it was meant to the the invert of `SM ? 25 h`. See https://vt100.net/docs/vt510-rm/DECRQM.html#T5-8 ANSI SM does not even have a mode 25 (IIRC) but DECSM does have, which shows/hides the cursor. I think that was the intend here. ### Steps to reproduce oh that's hard to tell ya. I don't want to get you to compile my project, but I am pretty sure it is findable without that. Maybe just be looking at what VT sequences conhost generates (`SM 25 l` vs `SM ? 25 h`)? ### Expected Behavior `SM ? 25 h` is paired with `SM ? 25 l` :) ### Actual Behavior no question mark :)
claunia added the Product-ConhostResolution-Duplicate labels 2026-01-31 04:18:03 +00:00
claunia commented 2026-01-31 04:18:04 +00:00
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@j4james commented on GitHub (Jul 31, 2021):

I believe this was fixed in PR #5181 (see commit 466e8fc654).

@j4james commented on GitHub (Jul 31, 2021): I believe this was fixed in PR #5181 (see commit https://github.com/microsoft/terminal/pull/5181/commits/466e8fc654793dd655bf5ddd408b15fe8be7b964).
claunia commented 2026-01-31 04:18:04 +00:00
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@skyline75489 commented on GitHub (Jul 31, 2021):

Well then it will have to wait for the next related “Windows Update” to really fix it.😅

@skyline75489 commented on GitHub (Jul 31, 2021): Well then it will have to wait for the next related “Windows Update” to really fix it.😅
claunia commented 2026-01-31 04:18:04 +00:00
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@j4james commented on GitHub (Jul 31, 2021):

If you want to make sure that Contour has all the latest fixes, I think it's actually possible to bundle a recent build of openconsole with your app, and use that instead of the conhost that's included in Windows. Although not officially supported yet, apparently both WezTerm and Visual Studio do something like that. For more info, see the discussion in https://github.com/alacritty/alacritty/pull/4501#issuecomment-735445218.

@j4james commented on GitHub (Jul 31, 2021): If you want to make sure that Contour has all the latest fixes, I think it's actually possible to bundle a recent build of openconsole with your app, and use that instead of the conhost that's included in Windows. Although not officially supported yet, apparently both WezTerm and Visual Studio do something like that. For more info, see the discussion in https://github.com/alacritty/alacritty/pull/4501#issuecomment-735445218.
claunia commented 2026-01-31 04:18:04 +00:00
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@christianparpart commented on GitHub (Jul 31, 2021):

Thanks James. That is a very appealing idea. :)

@christianparpart commented on GitHub (Jul 31, 2021): Thanks James. That is a very appealing idea. :)
claunia commented 2026-01-31 04:18:04 +00:00
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@zadjii-msft commented on GitHub (Aug 2, 2021):

@christianparpart The Terminal itself actually also that same method of shipping a conhost side-by-side in our package so we can ingest conpty fixes faster haha.

For now I guess I'll call this /dup #5181

@zadjii-msft commented on GitHub (Aug 2, 2021): @christianparpart The Terminal itself actually also that same method of shipping a conhost side-by-side in our package so we can ingest conpty fixes faster haha. For now I guess I'll call this /dup #5181
claunia commented 2026-01-31 04:18:05 +00:00
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@ghost commented on GitHub (Aug 2, 2021):

Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!

@ghost commented on GitHub (Aug 2, 2021): Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!
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Reference: starred/terminal#14733
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