Every shells have an implementation of weston_desktop_api structures.
It includes some callbacks to listen to xdg_surface signals. Committed callback
is one of them.
Currently, the xdg_shell don't invoke the weston_desktop_api->committed
callback when the xdg_surface is initial stage or no surface content.
In the case: the client attached a null buffer after the valid buffer,
the shell isn't going to invoke to xdg_surface committed, and don't know
the surface is disappeared. If the surface is fullscreen, we will get
a black background on the screen until a new valid frame come. That
should not happen.
Signed-off-by: Tran Ba Khang(MS/EMC31-XC) <Khang.TranBa@vn.bosch.com>
776fafe13a