Getting a blank area top where toolbar was on Mangowm screen shots #417

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1. devmobasa commented on Oct 18, 2026

   

   devmobasa

   on Oct 18, 2026

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   Thanks for the report and the screenshots. I found the most likely cause. Pull request #418 fixes it.

   Try the fix from main

   To use the fix, run these commands in the source checkout from your last build:

   cd wayscriber
   git pull
   ./tools/install.sh --replace-other   # builds, installs to /usr/bin, removes the /usr/local copy
   systemctl --user restart wayscriber.service   # or stop your daemon and run /usr/bin/wayscriber --daemon

   Make sure that the daemon uses the new build:

   readlink -f /proc/$(systemctl --user show -p MainPID --value wayscriber.service)/exe
   git rev-parse --short HEAD

   The first command must show /usr/bin/wayscriber. The second command shows the commit of your build.

   Wait for the release

   If you prefer to wait for the release, use the built-in toolbar until then:

   [ui.toolbar]
   backend = "builtin"

   Test

   Please take a full-screen screenshot and a region screenshot with the GTK toolbar.

   If the rectangle is still there, send me this information:

   • The commit of your build
   • Whether you have a ~/.config/gtk-4.0/gtk.css file
   • Whether you use a custom GTK theme.

   Cause and fix

   Cause: During a screenshot, the GTK toolbar makes its window transparent. GTK gives user stylesheets a higher priority than the styles of the app. A theme often installs a user stylesheet at ~/.config/gtk-4.0/gtk.css. If this stylesheet set a window background, GTK painted it on the toolbar window during the screenshot. As a result, the screenshot showed a solid rectangle with the size of the toolbar. I got the same rectangle with the 0.9.27 release on MangoWM and a user stylesheet.

   Fix: During a screenshot, wayscriber applies its own styles above the user stylesheets. These styles make the toolbar window, its open popovers, and its tooltips transparent. After the screenshot, wayscriber removes these styles. Then your normal styles return. The fix does not need a configuration change.

   Side effect: Toolbar popovers always use the wayscriber shadow. A user stylesheet cannot change this shadow, because a different shadow size can cancel the screenshot.
2. xircon commented on Oct 18, 2026

   

   xircon

   on Oct 18, 2026

   Last edited by xircon

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   readlink -f /proc/$(systemctl --user show -p MainPID --value wayscriber.service)/exe       
   /usr/bin/wayscriber
   
    git rev-parse --short HEAD                                                            
   0d855869
   

   

   and yes, I have a huge gtk.css - no idea where it came from - going to reboot, BRB.

   OK - removed the gtk.css file and all seems OK:

   

   I have no idea what hijacked my gtk.css file!!!

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3. devmobasa

   closed this as completedin #418on Oct 18, 2026
4. devmobasa commented on Oct 18, 2026

   

   devmobasa

   on Oct 18, 2026

   Last edited by devmobasa

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   Thanks for the test. Your build is from commit 0d85586. That is the 0.9.27 release, without the fix. I merged the fix (ce68c7d) a few minutes after your git pull. As a result, your screenshot still shows the same #23252e rectangle.

   Please pull again and install the new build:

   cd ~/git/wayscriber
   git pull
   ./tools/install.sh --replace-other
   systemctl --user restart wayscriber.service
   

   Make sure that git rev-parse --short HEAD shows ce68c7d or a later commit.

   You can keep your gtk.css for this test. It is the most likely cause of the rectangle, so it shows if the fix works. A reboot is not necessary. A restart of the service is sufficient.
5. xircon commented on Oct 18, 2026

   

   xircon

   on Oct 18, 2026

   Last edited by xircon

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   lrwxrwxrwx x x  69 B  2026-10-08 21:18 --  gtk.css-old3 ⇒ /home/xircon/.themes/Flat-Remix-GTK-Violet-Dark-Solid/gtk-4.0/gtk.css
   

   It was a theme that hijacked it. Rebuilding now.

   ce68c7d8
   

   
6. xircon commented on Oct 18, 2026

   

   xircon

   on Oct 18, 2026

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   Can close - all appears OK, night and thanks for the help!!

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7. devmobasa commented on Oct 18, 2026

   

   devmobasa

   on Oct 18, 2026

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   Thanks for reporting. Have a good one.

   If you feel like testing the fix:

   Put the theme link back and restart the daemon:

   mv ~/.config/gtk-4.0/gtk.css-old3 ~/.config/gtk-4.0/gtk.css
   systemctl --user restart wayscriber.service
   

   Then take a full-screen screenshot and a region screenshot. With the fix (ce68c7d), the rectangle must not show. After the test, you can keep the theme or remove the link again.
8. xircon commented on Oct 18, 2026

   

   xircon

   on Oct 18, 2026

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9. xircon commented on Oct 18, 2026

   

   xircon

   on Oct 18, 2026

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   All good - thinking back, was helping someone configure labwc on the endeavourOS forum and tested a few themes, that is probably the cause - mango does not really "use" themes.

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10. devmobasa commented on Oct 18, 2026

    

    devmobasa

    on Oct 18, 2026

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    I see.

    Thanks for testing with the theme back in place.

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