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Virtual device inform if screen update is needed or not with SYNTHVID_FEATURE_CHANGE message. Handle this message to set dirt_needed flag. Suggested-by: Dexuan Cui <decui@microsoft.com> Signed-off-by: Deepak Rawat <drawat.floss@gmail.com> Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patchwork.freedesktop.org/patch/msgid/20210527112230.1274-2-drawat.floss@gmail.com