On Wayland Qt paints the title bar through its adwaita decoration plugin,
which hardcodes pure white in light mode and ignores the palette. Every
window now goes frameless and gets an app-drawn bar in the palette's Window
color, so it follows the Background setting. Buttons follow GNOME's
button-layout; moving, snapping and edge resizing still go through the
compositor. Windows grow by the bar's height so their contents keep the
size they had.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
