On KDE Plasma 6 / KWin 6 the frameless chrome still showed the native
title bar even with the decoration code compiled in. The KDE
server-decoration request ran on the GtkWidget "realize" signal, but
GTK's Wayland backend only creates the wl_surface on map — so at realize
gdk_wayland_window_get_wl_surface() was null and the request bailed,
leaving KWin (which defaults to server-side decorations on Wayland) to
draw its title bar.
Also connect the handler to "map", where the surface is live. The realize
pass still does the X11 gdk_window_set_decorations hint and bails harmlessly
on the Wayland part, so no duplicate decoration object is created.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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