8000 Zoom behavior not as expected · Issue #420 · amirlehmam/wmux · GitHub
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Zoom behavior not as expected #420

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Zoom behavior not as expected#420

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@richardaubin
richardaubin
opened on Nov 1, 2026

Shown in video is expected behavior of terminal:
https://github.com/user-attachments/assets/c811844d-f502-4e0a-897b-61aadc2c4353

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  1. amirlehmam commented on Nov 1, 2026

    @amirlehmam
    amirlehmam
    on Nov 1, 2026
    Owner

    Thanks for the video. I can see the behavior you expect in Windows Terminal, but the report does not show the corresponding wmux behavior or the input used to trigger zoom. Could you share your wmux version, the keys or mouse gesture you use, and a short recording of what happens in wmux with the same steps? Please also say whether you expect only the active pane or every pane to change size. That will let me reproduce the mismatch without guessing. I'll leave this open while investigating.

  2. richardaubin commented on Nov 2, 2026

    @richardaubin
    richardaubin
    on Nov 2, 2026
    Author

    Another video with audio describing the issue in more detail.

    wmux-zoom.mp4
  3. amirlehmam
    added a commit that references this issue on Nov 3, 2026

    fix(zoom): zoom a terminal pane through its font, like Windows Termin…

    71d89ba

  4. amirlehmam commented on Nov 3, 2026

    @amirlehmam
    amirlehmam
    on Nov 3, 2026
    Owner

    Thanks for the second video, it showed the problem clearly. Pane zoom applied CSS zoom to the whole pane, but xterm measures its cells without that zoom. The terminal then fitted the wrong number of columns, drew into a corner of the pane, and never resized the shell.

    In 2.55.0 a terminal zooms through its font, a 6195 s Windows Terminal does. The text reflows to fill the pane and the shell gets the new size:

    • Ctrl+mousewheel zooms the pane under the pointer, or the focused pane when the pointer is over no pane.
    • Ctrl+= / Ctrl+- zoom the focused pane, and Ctrl+0 resets it. They no longer change the global font size, which stays in Settings.
    • Ctrl+Shift+mousewheel still zooms the whole window.
    • Per-pane zoom isn't saved across restarts, as in Windows Terminal.

    Could you confirm this matches what you expected after updating?

  5. richardaubin commented on Nov 3, 2026

    @richardaubin
    richardaubin
    on Nov 3, 2026
    Author

    This indeed is what I was looking for.

    Great job!

  6. richardaubin
    closed this as completedon Nov 3, 2026
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