F11 overtaken by OS but not for Flatpak

[Klaaktu]

I set F11 to fullscreen (for any window) in GNOME settings (Fedora 40). And when I press F11, Flatpak VSCodium correctly detect that's in fullscreen, but not the RPM version:
The window goes fullscreen but right clicking on the search bar doesn't show "Hide title bar in fullscreen" option.
I have set window.customTitleBarVisibility to "window", and the Flatpak version hides title bar correctly but the RPM version doesn't.
And vice-versa, if I go fullscreen via the menu option, the title bar hides but won't show up by pressing F11 to quit fullscreen, so I'm unable to quit the app due to quit button being hidden.

[aaronthefullstackengineer]

Yo @Klaaktu 👋

I feel you — this fullscreen title bar behavior is super annoying and it’s a classic difference between sandboxed Flatpak vs RPM / native builds on GNOME.

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What’s happening

• Flatpak VSCodium handles fullscreen + custom title bar correctly because the sandbox environment and GTK / windowing integration seems to play nicer with window.customTitleBarVisibility.
• RPM version relies on the system GTK / window manager, and apparently F11 fullscreen toggling doesn’t trigger the title bar hide/show logic properly.
• The inconsistencies you’re seeing are essentially the difference between how Flatpak intercepts and communicates window state vs native RPM binary.

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Workarounds / suggestions

1. Use menu fullscreen instead of F11

   • For the RPM version, use View -> Appearance -> Toggle Full Screen to enter/exit fullscreen. This reliably triggers the title bar hide/show behavior.

2. Custom keybinding in VSCodium

   • Remap a shortcut inside VSCodium (Settings → Keyboard Shortcuts) to workbench.action.toggleFullScreen. This ensures the editor knows about fullscreen state directly, rather than relying on GNOME F11.

3. Temporary tweak for title bar visibility

   • You can manually toggle window.customTitleBarVisibility in Settings (window ↔ native) when switching fullscreen modes if the title bar disappears and blocks access.

4. Consider Flatpak if consistent behavior is critical

   • If you rely heavily on fullscreen + custom title bar behavior, the Flatpak build is more predictable on GNOME / Fedora 40.

5. Report upstream / file a bug

   • The RPM packaging might need a tweak to respect F11 fullscreen events for title bar hiding. Opening a bug with VSCodium or Fedora package maintainers could help.

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Basically, Flatpak handles the fullscreen title bar dance better because of its sandbox integration, while RPM / native builds are more at the mercy of GNOME / GTK behavior. Using the internal menu or VSCodium shortcuts usually fixes the inconsistency.