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NON-wrapping double-height lines start inserting whitespace when within ≈7 chars of the edge of the screen❓ #22594

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opened 2026-01-31 08:17:56 +00:00 by claunia · 7 comments
claunia commented 2026-01-31 08:17:56 +00:00
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Originally created by @ClaireCJS on GitHub (Nov 26, 2024).

Windows Terminal version

1.21.2911.0

Windows build number

10.0.19045.5131

Other Software

No response

Steps to reproduce

New bug report that is similar, but different, to the line-wrapping bug report.

This does not involve line wrapping.

Something is happening.
And it is happening "prematurely": ≈7 columns from the right of the screen.

Somehow, getting "too close" to the right of the screen while in "big mode" (VT100 double-height text) is catalyzing some weird bug that inserts unnecessary whitespace.

It's very hard to work around.

This definitely isn't a wrapping situation, because the lines are too short to need to be wrapped!

rem Adjust terminal width to 209 columns first...
pause

set big_bot=←#4
set big_top=←#3
set message=there are 209 columns...there are 209 columns...there are 209 columns...there are 209 columns....
rem length of message is 97
rem length of message in double-height size is 194 — less than our 209 columns
echo %message%

echo ----------- BUGGY:
echo %big_top%%message% 
echo %big_bot%%message%
echo -----------

rem This message is one character shorter:
set message=there are 209 columns...there are 209 columns...there are 209 columns...there are 209 columns...

echo ----------- NOT BUGGY:
echo %big_top%%message% 
echo %big_bot%%message%
echo -----------

Image
(eset is just an inline environment variable editor so i could remove one of the periods at the end)

^ I can't think of a conceivable reason in existence for this blank line to start appearing when you get ~7 from the right like that

Expected Behavior

Expected behavior is that it looks like the top line here, not the bottom line here:

Image

In case you're asking how I got the top line to render correctly, when claiming a bug prevents this .... I scaled it down to a smaller text size of 236 columns, echo'ed it, then scaled back up to a larger text size of the original 209 columns.

As you can see, the message (the one with 4 periods at the end, not 3!) fits just fine in a 209 column space.

Why this whitespace is inserted is a mystery to me.

Actual Behavior

Image

Originally created by @ClaireCJS on GitHub (Nov 26, 2024). ### Windows Terminal version 1.21.2911.0 ### Windows build number 10.0.19045.5131 ### Other Software _No response_ ### Steps to reproduce New bug report that is similar, but different, to the line-wrapping bug report. **This does not involve line wrapping.** Something is happening. And it is happening "prematurely": ≈7 columns from the right of the screen. Somehow, getting "too close" to the right of the screen while in "big mode" (VT100 double-height text) is catalyzing some weird bug that inserts unnecessary whitespace. It's very hard to work around. This definitely isn't a wrapping situation, because the lines are too short to need to be wrapped! ``` rem Adjust terminal width to 209 columns first... pause set big_bot=←#4 set big_top=←#3 set message=there are 209 columns...there are 209 columns...there are 209 columns...there are 209 columns.... rem length of message is 97 rem length of message in double-height size is 194 — less than our 209 columns echo %message% echo ----------- BUGGY: echo %big_top%%message% echo %big_bot%%message% echo ----------- rem This message is one character shorter: set message=there are 209 columns...there are 209 columns...there are 209 columns...there are 209 columns... echo ----------- NOT BUGGY: echo %big_top%%message% echo %big_bot%%message% echo ----------- ``` ![Image](https://github.com/user-attachments/assets/0bd6aac8-1fe8-4dfe-b0fa-75568aea3944) (```eset``` is just an inline environment variable editor so i could remove one of the periods at the end) ^ I can't think of a conceivable reason in existence for this blank line to start appearing when you get ~7 from the right like that ### Expected Behavior Expected behavior is that it looks like the top line here, not the bottom line here: ![Image](https://github.com/user-attachments/assets/8862bfb6-cc30-4e89-a386-3f985b4d43f3) In case you're asking how I got the top line to render correctly, when claiming a bug prevents this .... I scaled it down to a smaller text size of 236 columns, ```echo```'ed it, then scaled back up to a larger text size of the original 209 columns. As you can see, the message (the one with 4 periods at the end, not 3!) _fits just fine_ in a 209 column space. Why this whitespace is inserted is a mystery to me. ### Actual Behavior ![Image](https://github.com/user-attachments/assets/3580d172-b119-4a31-9ddb-a711ae596ade)
claunia added the Issue-BugResolution-Duplicate labels 2026-01-31 08:17:57 +00:00
claunia commented 2026-01-31 08:17:58 +00:00
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@similar-issues-ai[bot] commented on GitHub (Nov 26, 2024):

We've found some similar issues:

  • #18185 , similarity score: 81%

If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue.

Note: You can give me feedback by 👍 or 👎 this comment.

@similar-issues-ai[bot] commented on GitHub (Nov 26, 2024): We've found some similar issues: - #18185 , similarity score: 81% If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue. > Note: You can give me feedback by 👍 or 👎 this comment.
claunia commented 2026-01-31 08:17:58 +00:00
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@ClaireCJS commented on GitHub (Nov 26, 2024):

We've found some similar issues:

If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue.

Note: You can give me feedback by 👍 or 👎 this comment.

Previous report wasn't reproduceable so I closed it.

This report is the proper version for the old one.

Sorry. Still getting used to things here.

@ClaireCJS commented on GitHub (Nov 26, 2024): > We've found some similar issues: > > * [ANSI double-height 2️⃣ lines line-wrap several columns too early ❗ #18185](https://github.com/microsoft/terminal/issues/18185) , similarity score: 81% > > If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue. > > > Note: You can give me feedback by 👍 or 👎 this comment. Previous report wasn't reproduceable so I closed it. This report is the proper version for the old one. Sorry. Still getting used to things here.
claunia commented 2026-01-31 08:17:59 +00:00
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@j4james commented on GitHub (Nov 26, 2024):

@ClaireCJS I suspect this is just a variation of issue #18091, and most likely only occurs with odd column widths. See my explanation in https://github.com/microsoft/terminal/issues/18091#issuecomment-2427447319. It should be fixed in the latest preview build.

@j4james commented on GitHub (Nov 26, 2024): @ClaireCJS I suspect this is just a variation of issue #18091, and most likely only occurs with odd column widths. See my explanation in https://github.com/microsoft/terminal/issues/18091#issuecomment-2427447319. It should be fixed in the latest preview build.
claunia commented 2026-01-31 08:17:59 +00:00
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@DHowett commented on GitHub (Nov 26, 2024):

@ClaireCJS can you try it out in Preview or Canary?

Preview

Canary

@DHowett commented on GitHub (Nov 26, 2024): @ClaireCJS can you try it out in Preview or Canary? [Preview](https://aka.ms/terminal-preview) [Canary](https://github.com/microsoft/terminal/discussions/16121)
claunia commented 2026-01-31 08:17:59 +00:00
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@ClaireCJS commented on GitHub (Nov 26, 2024):

@ClaireCJS can you try it out in Preview or Canary?

Preview

Canary

Yup! It's fixed in terminal-preview!!! Sweet, thank you!!!

@ClaireCJS commented on GitHub (Nov 26, 2024): > [@ClaireCJS](https://github.com/ClaireCJS) can you try it out in Preview or Canary? > > [Preview](https://aka.ms/terminal-preview) > > [Canary](https://github.com/microsoft/terminal/discussions/16121) Yup! It's fixed in terminal-preview!!! Sweet, thank you!!!
claunia commented 2026-01-31 08:17:59 +00:00
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@DHowett commented on GitHub (Nov 26, 2024):

Thanks for confirming! /dup #18091

@DHowett commented on GitHub (Nov 26, 2024): Thanks for confirming! /dup #18091
claunia commented 2026-01-31 08:18:00 +00:00
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@microsoft-github-policy-service[bot] commented on GitHub (Nov 26, 2024):

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!

@microsoft-github-policy-service[bot] commented on GitHub (Nov 26, 2024): 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! <!-- Policy app identification https://img.shields.io/static/v1?label=PullRequestIssueManagement. -->
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Reference: starred/terminal#22594
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