Windows are fully damaged if the client damages any part

[soreau]

Before, testing with pavucontrol and showrepaint plugin, only the part of the window that changed were damaged. Now, the pavucontrol window is fully damaged if the client damages any part. Also tested with minimal set of plugins autostart move resize showrepaint and the problem still occurs. Have not bisected yet, but this is the next planned step.

[ammen99]

I cannot reproduce with latest master, pavucontrol, terminator, etc. all work fine. One thing to note is that terminator no longer always damages a part of the screen when typing (it used to do that before), however, I can make it submit partial damage when I select a line of text. pavucontrol also seems to damage only a part of the surface, and that works in showrepaint too.