Do not enable "gtk-dialogs-use-header" by default
The builtin GTK dialogs should not use header bars while most Xfce applications (Thunar, Mousepad, etc.) are not redesigned yet and full CSD is not activated yet.
The builtin GTK dialogs should not use header bars while most Xfce applications (Thunar, Mousepad, etc.) are not redesigned yet and full CSD is not activated yet.