weston flip a null frame first before start launcher

[zou lan]

Hi pekka & others

I find weston flip a null frame before start the launcher
weston-desktop-shell. So there is always a black surface flash before the
launcher. That doesn't have the relationship with the animation mode.
I think it's caused by the code weston_output_init which call
the weston_output_damage.

weston_output_damage will paint nothing if the animation mode is noe and
flip one frame.

Does this frame is normal or my implementions have problems?  Thank you.
I try it on weston version 1.8 and 1.9.

weston.ini
[shell]
animation=none
startup-animation=none
client=/usr/lib/weston/weston-desktop-shell


Best Regards
Nancy
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