Wayland: add DARKTABLE_HIDE_TITLEBAR_ON_MAXIMIZE to disable HeaderBar for Unite compatibility #19694
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…ized hint; opt-in HeaderBar via env/config
… for Unite compatibility
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Summary
Keep the original Wayland behavior from master (GtkHeaderBar / client-side decorations). Add a single opt-in flag so GNOME Shell extensions (e.g. Unite) can hide the titlebar cleanly and reclaim space.
Behavior
Default (Wayland): GtkHeaderBar shown, unchanged from master.
Opt-in compatibility mode:
Enable via DARKTABLE_HIDE_TITLEBAR_ON_MAXIMIZE=1 (or ui/hide_titlebar_on_maximize=true)
Effect: no GtkHeaderBar, server-side decorations used, gtk_window_set_hide_titlebar_when_maximized(TRUE). Allows WM/extension to hide titlebar without a gap.
Implementation
Added conditional logic in [gtk.c]
Testing
Default: header bar visible as before.
With DARKTABLE_HIDE_TITLEBAR_ON_MAXIMIZE=1: Unite hides titlebar; window resizes (no top gap).