void gtk_window_set_hide_titlebar_when_maximized ( GtkWindow* window, gboolean setting )
window will request that it’s titlebar
should be hidden when maximized.
This is useful for windows that don’t convey any information other
than the application name in the titlebar, to put the available
screen space to better use. If the underlying window system does not
support the request, the setting will not have any effect.
Note that custom titlebars set with
not affected by this. The application is in full control of their
content and visibility anyway.