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Terminal renders gaps in between some lines #2251

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opened 2026-01-30 22:50:39 +00:00 by claunia · 6 comments
claunia commented 2026-01-30 22:50:39 +00:00
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Originally created by @ocalvo on GitHub (Jun 26, 2019).

Environment

Windows 10 19H1

Windows build number: 10.0.18362.175
Windows Terminal version (if applicable):

Any other software?
[ZtreeWin](http://www.ztree.com/html/ztreewin.htm)

Steps to reproduce

1 - Install ZtreeWin, or PowerShell PowerTab
2 - Make Terminal Window large
3 - Execute ztw or [TAB] in PowerShell with PowerTab enabled

Expected behavior

PowerTab Good ZtwOLD

Actual behavior

PowerTab Bad ZtwNEW

There are multiple horizontal lines that should not be there.

Originally created by @ocalvo on GitHub (Jun 26, 2019). <!-- This bug tracker is monitored by Windows Terminal development team and other technical folks. **Important: When reporting BSODs or security issues, DO NOT attach memory dumps, logs, or traces to Github issues**. Instead, send dumps/traces to secure@microsoft.com, referencing this GitHub issue. Please use this form and describe your issue, concisely but precisely, with as much detail as possible. --> # Environment Windows 10 19H1 ```none Windows build number: 10.0.18362.175 Windows Terminal version (if applicable): Any other software? [ZtreeWin](http://www.ztree.com/html/ztreewin.htm) ``` # Steps to reproduce 1 - Install [ZtreeWin](http://www.ztree.com/html/ztreewin.htm), or PowerShell PowerTab 2 - Make Terminal Window large 3 - Execute ztw or [TAB] in PowerShell with PowerTab enabled <!-- A description of how to trigger this bug. --> # Expected behavior <img width="437" alt="PowerTab Good" src="https://user-images.githubusercontent.com/2091582/60294002-3f5c9980-98d5-11e9-9463-502baed71a5a.PNG"> <img width="607" alt="ZtwOLD" src="https://user-images.githubusercontent.com/2091582/60141398-2388b480-976a-11e9-8c5d-71e4fde9d7a5.png"> <!-- A description of what you're expecting, possibly containing screenshots or reference material. --> # Actual behavior <img width="487" alt="PowerTab Bad" src="https://user-images.githubusercontent.com/2091582/60294013-44b9e400-98d5-11e9-9636-f62b2c2267c0.PNG"> <img width="891" alt="ZtwNEW" src="https://user-images.githubusercontent.com/2091582/60141401-27b4d200-976a-11e9-892b-cf53ecc0d84e.png"> <!-- What's actually happening? --> There are multiple horizontal lines that should not be there.
claunia commented 2026-01-30 22:50:40 +00:00
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@miniksa commented on GitHub (Jun 27, 2019):

This is sort of like #404, but my psychic debugging says this is floating point measuring of lines going awry and it might be really smart to just wholesale move to GDI measuring like #1298 suggested.

@miniksa commented on GitHub (Jun 27, 2019): This is sort of like #404, but my psychic debugging says this is floating point measuring of lines going awry and it might be really smart to just wholesale move to GDI measuring like #1298 suggested.
claunia commented 2026-01-30 22:50:41 +00:00
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@ocalvo commented on GitHub (Jun 28, 2019):

I think there are 2 issues here, one that is dependent on DPI.

For example ZTW at 200 DPI shows like these:
Ztw DPI200

  • Notice the horizontal lines
  • Notice the vertical lines are not continuous

For ZTW at 100 DPI:
Ztw DPI100

  • Notice that the horizontal lines are fixed.
  • But the vertical lines are still not continuous.

Baseline:
ZtwOLD

@ocalvo commented on GitHub (Jun 28, 2019): I think there are 2 issues here, one that is dependent on DPI. For example ZTW at 200 DPI shows like these: <img width="823" alt="Ztw DPI200" src="https://user-images.githubusercontent.com/2091582/60309009-89a74000-9900-11e9-83a7-b6310cc51b48.PNG"> - Notice the horizontal lines - Notice the vertical lines are not continuous For ZTW at 100 DPI: <img width="552" alt="Ztw DPI100" src="https://user-images.githubusercontent.com/2091582/60309026-aba0c280-9900-11e9-8692-7ec748afa212.PNG"> - Notice that the horizontal lines are fixed. - But the vertical lines are still not continuous. Baseline: <img width="607" alt="ZtwOLD" src="https://user-images.githubusercontent.com/2091582/60309039-c5420a00-9900-11e9-97a2-d824aa0197a4.png">
claunia commented 2026-01-30 22:50:41 +00:00
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@thomaslevesque commented on GitHub (Sep 20, 2019):

I see the same thing with display scaling at 125% or 150%. Works fine at 100%.
Particularly annoying when using oh-my-posh, or anything that relies on fonts with Powerline glyphs

@thomaslevesque commented on GitHub (Sep 20, 2019): I see the same thing with display scaling at 125% or 150%. Works fine at 100%. Particularly annoying when using oh-my-posh, or anything that relies on fonts with Powerline glyphs
claunia commented 2026-01-30 22:50:41 +00:00
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@wmcbrine commented on GitHub (Nov 4, 2019):

Vertical gaps also sometimes occur. I am using 125% scaling.

@wmcbrine commented on GitHub (Nov 4, 2019): Vertical gaps also sometimes occur. I am using 125% scaling.
claunia commented 2026-01-30 22:50:41 +00:00
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@DHowett-MSFT commented on GitHub (Jan 28, 2020):

/dup #3626

@DHowett-MSFT commented on GitHub (Jan 28, 2020): /dup #3626
claunia commented 2026-01-30 22:50:41 +00:00
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@ghost commented on GitHub (Jan 28, 2020):

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 (Jan 28, 2020): 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#2251
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