46e5236bbe
Damage coordinates are relative to the drawable, (0,0) being the top left corner inside the border. Therefore, when applying damages or accumulating damages between window buffers, we need to take the window border width into account as well, otherwise the updates might be only partial or misplaced. Related: https://gitlab.freedesktop.org/xorg/xserver/issues/951 Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
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