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Vim output getting skewed and duplicated chaotically when increasing the font size or resizing the window #10083

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opened 2026-01-31 02:12:06 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 02:12:06 +00:00
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Originally created by @Tompouce-onGit on GitHub (Aug 10, 2020).

Originally assigned to: @DHowett on GitHub.

Environment

Windows build number: 10.0.18363.0
Windows Terminal version (if applicable): 1.1.2021.0

Any other software?
Vim, version 8.1

Steps to reproduce

Open Windows Terminal and, in a powershell tab, launch vim with a file containing text.
Change the font size with CTRL+MouseWheelScroll.
Resize the terminal window by draging one of the sides.

Expected behavior

The output of vim should stay stable, i.e. simply get bigger or smaller, with CTRL+MouseWheelScroll, and not budge when resizing the window.

Actual behavior

As the title implies, the output gets skewed and spread over the screen in a chaotic fashion, lines fall out of allignment with each other and get duplicated upwards when resizing the font ; resizing the windows after that does the same. This is illustrated in this mp4 screen capture (I had troubles recording a gif, so I had to make an mp4 file).

Note that, right after starting vim, resizing the windows does not affect the output the same way if the font size was not changed with CTRL+MouseWheelScroll before. Instead, as the window is being resized, the lines flicker as they get dragged horizontally accross the window. When the resizing motion is stopped, they fall back into their intended positions and the output stabilizes, but lines of the file still get duplicated above chaoticaly, which can be seen by scrolling up. This is illustrated in this mp4 screen capture.

This is an issue with the display of the text output when using vim, I have not tested it with other software, and while the displayed text gets skewed and duplicated, the actual contents of the file being viewed don't get modified by this.

Finaly, note that the abnormal behaviours described above do not occur in a regular powershell window, i.e. an instance of powershell created with the powershell start menu icon. They only occur in Windows Terminal.

Originally created by @Tompouce-onGit on GitHub (Aug 10, 2020). Originally assigned to: @DHowett on GitHub. <!-- 🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨 I ACKNOWLEDGE THE FOLLOWING BEFORE PROCEEDING: 1. If I delete this entire template and go my own path, the core team may close my issue without further explanation or engagement. 2. If I list multiple bugs/concerns in this one issue, the core team may close my issue without further explanation or engagement. 3. If I write an issue that has many duplicates, the core team may close my issue without further explanation or engagement (and without necessarily spending time to find the exact duplicate ID number). 4. If I leave the title incomplete when filing the issue, the core team may close my issue without further explanation or engagement. 5. If I file something completely blank in the body, the core team may close my issue without further explanation or engagement. All good? Then proceed! --> <!-- 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. If this is an application crash, please also provide a Feedback Hub submission link so we can find your diagnostic data on the backend. Use the category "Apps > Windows Terminal (Preview)" and choose "Share My Feedback" after submission to get the link. Please use this form and describe your issue, concisely but precisely, with as much detail as possible. --> # Environment ```none Windows build number: 10.0.18363.0 Windows Terminal version (if applicable): 1.1.2021.0 Any other software? Vim, version 8.1 ``` # Steps to reproduce Open Windows Terminal and, in a powershell tab, launch vim with a file containing text. Change the font size with CTRL+MouseWheelScroll. Resize the terminal window by draging one of the sides. # Expected behavior The output of vim should stay stable, i.e. simply get bigger or smaller, with CTRL+MouseWheelScroll, and not budge when resizing the window. # Actual behavior As the title implies, the output gets skewed and spread over the screen in a chaotic fashion, lines fall out of allignment with each other and get duplicated upwards when resizing the font ; resizing the windows after that does the same. This is illustrated in [this](https://imgur.com/a/SX25111) mp4 screen capture (I had troubles recording a gif, so I had to make an mp4 file). Note that, right after starting vim, resizing the windows does not affect the output the same way if the font size was not changed with CTRL+MouseWheelScroll before. Instead, as the window is being resized, the lines flicker as they get dragged horizontally accross the window. When the resizing motion is stopped, they fall back into their intended positions and the output stabilizes, but lines of the file still get duplicated above chaoticaly, which can be seen by scrolling up. This is illustrated in [this](https://imgur.com/a/M695jOz) mp4 screen capture. This is an issue with the display of the text output when using vim, I have not tested it with other software, and while the displayed text gets skewed and duplicated, the actual contents of the file being viewed don't get modified by this. Finaly, note that the abnormal behaviours described above do *not* occur in a regular powershell window, i.e. an instance of powershell created with the powershell start menu icon. They only occur in Windows Terminal.
claunia added the Issue-BugResolution-DuplicateProduct-Terminal labels 2026-01-31 02:12:06 +00:00
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Reference: starred/terminal#10083
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