0126e6f275
Currently we flush damage for the "primary plane" every repaint, but this
is folly.
The drm backend may skip rendering entirely if using an all-planes
composition. This could leave the renderer plane in a messy state if a
surface on an overlay plane disappears.
Instead, let the backends flush the primary plane damage when they know
they need to render.
Fixes #864
Signed-off-by: Derek Foreman <derek.foreman@collabora.com>
(cherry picked from commit
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