[PATCH v3] xdg-shell: use case to change the app ID at runtime

[Jan-Marek Glogowski]

Am 15.07.19 um 16:20 schrieb glogow at fbihome.de:
> From: Jan-Marek Glogowski <glogow at fbihome.de>
> 
> LibreOffice is one big binary with explicit brandings for different
> application modules. This is represented in X11 by a different
> WM_CLASS setting for a window. The WM_CLASS is changed based on the
> loaded document at runtime. As a result LibreOffice already offers
> multiple desktop files with different icons, StartupWMClass
> entries and application names.
> 
> This amendment of the set_app_id request just explicitly specifies
> the use case to change a surfaces' app ID at runtime, so a compositor
> implementor is made aware of it. Just as the WM_CLASS, a change of
> the app ID should result in an update of the propertes of a surface
> depending on the app ID, like the window icon specified in the
> desktop file or a re-grouping of the surfaces in a task manager.

Signed-off-by: Jan-Marek Glogowski <glogow at fbihome.de>