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[1.18] Certain fonts will cause a renderer error (MesloLGM NF, Cascadia Code Nerd Font) #19951

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opened 2026-01-31 06:58:25 +00:00 by claunia · 10 comments
claunia commented 2026-01-31 06:58:25 +00:00
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Originally created by @ffes on GitHub (May 24, 2023).

Windows Terminal version

1.18.1421.0

Windows build number

10.0.19045.2965

Other Software

oh-my-posh v16.8.0
Ubuntu 22.04.02 LTS

Steps to reproduce

  • Make sure oh-my-posh is started automatically on startup
  • Open a new tab
  • Notice the render problems
  • Press enters, type text
  • Notice even more render problems
  • Wait a while and see the renderer catch up

It seems impossible to create a screenshot with the snipping tool because when the focus on WT is lost, the renderer catches up immediately.

Tearing of a tab created an error the very first time, but couldn't reproduce it anymore.

Expected Behavior

No response

Actual Behavior

Various rendering issues

Originally created by @ffes on GitHub (May 24, 2023). ### Windows Terminal version 1.18.1421.0 ### Windows build number 10.0.19045.2965 ### Other Software oh-my-posh v16.8.0 Ubuntu 22.04.02 LTS ### Steps to reproduce - Make sure oh-my-posh is started automatically on startup - Open a new tab - Notice the render problems - Press enters, type text - Notice even more render problems - Wait a while and see the renderer catch up It seems impossible to create a screenshot with the snipping tool because when the focus on WT is lost, the renderer catches up immediately. Tearing of a tab created an error the very first time, but couldn't reproduce it anymore. ### Expected Behavior _No response_ ### Actual Behavior Various rendering issues
claunia added the Area-RenderingIssue-BugIn-PRProduct-Terminal labels 2026-01-31 06:58:25 +00:00
claunia commented 2026-01-31 06:58:26 +00:00
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@zadjii-msft commented on GitHub (May 24, 2023):

Could you share your settings.json file/?

This might be partially the font thing from #15403

@zadjii-msft commented on GitHub (May 24, 2023): Could you share your [settings.json file](https://github.com/microsoft/terminal/wiki/Frequently-Asked-Questions-(FAQ)#where-can-i-find-the-settings-file)/? This might be partially the font thing from #15403
claunia commented 2026-01-31 06:58:26 +00:00
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@lhecker commented on GitHub (May 24, 2023):

I'm sorry for causing the issue - We only noticed it mere hours before publishing 1.18 and I already opened a PR to fix it: #15403. If you can and don't mind, it'd be great if you could use an alternative font just for a week, because it would help us find other potential bugs you might encounter. I personally for instance like using Delugia. Otherwise, I hope we'll be able to ship a fix soon!

@lhecker commented on GitHub (May 24, 2023): I'm sorry for causing the issue - We only noticed it mere hours before publishing 1.18 and I already opened a PR to fix it: #15403. If you can and don't mind, it'd be great if you could use an alternative font just for a week, because it would help us find other potential bugs you might encounter. I personally for instance like using [Delugia](https://github.com/adam7/delugia-code). Otherwise, I hope we'll be able to ship a fix soon!
claunia commented 2026-01-31 06:58:27 +00:00
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@zadjii-msft commented on GitHub (May 25, 2023):

Collected notes from other threads:

Fixes:

If you're experiencing this, you can

  • Switch to another font temporarily. Delugia Code is apparently a bit better.
  • Manually disable the Atlas engine. You can do that in the settings.json like so: 
      "profiles":
  {
      "defaults":
      {
          "useAtlasEngine": false
    Or in the Settings UI:
    image
    You need to create new tabs after making this change, or restart the application. Existing tabs will retain the text renderer they were created with.

@lhecker also built a Windows Terminal Preview version that integrates the previous 3 AtlasEngine bug fixes, 2 of which might be relevant here: #15403 and #15425. You can download it here: blob.hecker.io/sharex/Microsoft.WindowsTerminalPreview_1.18.1443.0_8wekyb3d8bbwe.msixbundle I'm using my own personal domain because I don't want to expose my internal work addresses. However the file is properly cryptographically signed by Microsoft.

@zadjii-msft commented on GitHub (May 25, 2023): Collected notes from other threads: Fixes: * #15403 * #15427 * #15425 If you're experiencing this, you can * Switch to another font temporarily. Delugia Code is apparently a bit better. * Manually disable the Atlas engine. You can do that in the `settings.json` like so: ```json "profiles": { "defaults": { "useAtlasEngine": false ``` Or in the Settings UI: ![image](https://user-images.githubusercontent.com/2256941/240756131-c5ee4574-301f-486c-af26-cb9b0316674a.png) **You need to create new tabs after making this change, or restart the application**. Existing tabs will retain the text renderer they were created with. --- @lhecker also built a Windows Terminal Preview version that integrates the previous 3 AtlasEngine bug fixes, 2 of which might be relevant here: #15403 and #15425. You can download it here: [blob.hecker.io/sharex/Microsoft.WindowsTerminalPreview_1.18.1443.0_8wekyb3d8bbwe.msixbundle](https://blob.hecker.io/sharex/Microsoft.WindowsTerminalPreview_1.18.1443.0_8wekyb3d8bbwe.msixbundle) I'm using my own personal domain because I don't want to expose my internal work addresses. However the file is properly cryptographically signed by Microsoft.
claunia commented 2026-01-31 06:58:27 +00:00
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@DennisGaida commented on GitHub (May 25, 2023):

Confirming that the version you posted does not have the reported problems.

@DennisGaida commented on GitHub (May 25, 2023): Confirming that the version you posted does not have the reported problems.
claunia commented 2026-01-31 06:58:27 +00:00
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@withinboredom commented on GitHub (May 25, 2023):

We only noticed it mere hours before publishing 1.18

I'm not going to lie, I didn't even have the non-preview version installed and didn't even realize I was running the preview version. This thing is so rock solid for me, I wish I had it on my Linux machine.

Keep up the excellent work!

@withinboredom commented on GitHub (May 25, 2023): > We only noticed it mere hours before publishing 1.18 I'm not going to lie, I didn't even have the non-preview version installed and didn't even realize I was running the preview version. This thing is so rock solid for me, I wish I had it on my Linux machine. Keep up the excellent work!
claunia commented 2026-01-31 06:58:27 +00:00
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@rongzhao-ambit commented on GitHub (May 26, 2023):

I can confirm the rendering error with Nerd Font v3 (Cascadia Cove Nerd Font Mono) when using neovim with nerd font v3 symbols.

After turning off Atlas Engine, the rendering is now normal!

Nerd Font v3 was released in late April this year. So there might be more undiscovered bugs with the new utf8 characters introduced in Nerd Font v3 specs.

@rongzhao-ambit commented on GitHub (May 26, 2023): I can confirm the rendering error with Nerd Font v3 (Cascadia Cove Nerd Font Mono) when using neovim with nerd font v3 symbols. After turning off `Atlas Engine`, the rendering is now normal! Nerd Font v3 was released in late April this year. So there might be more undiscovered bugs with the new utf8 characters introduced in Nerd Font v3 specs.
claunia commented 2026-01-31 06:58:28 +00:00
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@ffes commented on GitHub (May 29, 2023):

Just tried v1.18.1462.0 and indeed the problem is fixed. Thanks a lot for fixing this so quickly.

@ffes commented on GitHub (May 29, 2023): Just tried v1.18.1462.0 and indeed the problem is fixed. Thanks a lot for fixing this so quickly.
claunia commented 2026-01-31 06:58:28 +00:00
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@withinboredom commented on GitHub (May 31, 2023):

@zadjii-msft -- still seeing some differences in rendering. This is original:

image

This is 1.18.1462.0

image

I can't figure out how to give you a simple reproduction, but the easiest would be to install oh-my-zsh and go through the powerlevel10k installation wizard which does a whole bunch of interesting things to the terminal.

@withinboredom commented on GitHub (May 31, 2023): @zadjii-msft -- still seeing some differences in rendering. This is original: <img width="848" alt="image" src="https://github.com/microsoft/terminal/assets/1883296/8ed13e3e-4d1b-44d9-b6b5-d92be88a14fe"> This is 1.18.1462.0 <img width="844" alt="image" src="https://github.com/microsoft/terminal/assets/1883296/98be6ad2-c428-4e76-9b86-ed041968eff7"> I can't figure out how to give you a simple reproduction, but the easiest would be to install oh-my-zsh and go through the powerlevel10k installation wizard which does a whole bunch of interesting things to the terminal.
claunia commented 2026-01-31 06:58:28 +00:00
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@zadjii-msft commented on GitHub (May 31, 2023):

@withinboredom Mind filing a new issue? That looks like a much more minor graphical error, vs the pretty substantial issue this thread was originally tracking. Thanks!

@zadjii-msft commented on GitHub (May 31, 2023): @withinboredom Mind filing a new issue? That looks like a much more minor graphical error, vs the pretty substantial issue this thread was originally tracking. Thanks!
claunia commented 2026-01-31 06:58:28 +00:00
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@withinboredom commented on GitHub (May 31, 2023):

Will do, thanks for the fast response @zadjii-msft !

@withinboredom commented on GitHub (May 31, 2023): Will do, thanks for the fast response @zadjii-msft !
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