After activating the effect for a given window, the thumbnail updates are not happening, the thumbnail even disappears if another window is moved to it's area. It only updates if the attached window updates for some reason.
Steps to Reproduce:
1. Enable Effect
2. Toggle it for a window.
3. Start move windows around
damage events of the thumbnail are handled correctly, but updates in this area do not work correctly.
Git commit 27172bbcc07d883ff765b1198778178eb58627a4 by Martin Gräßlin.
Committed on 09/01/2013 at 10:09.
Pushed by graesslin into branch 'KDE/4.10'.
Track painted areas in Thumbnail Aside effect
Following the approach of ShowPaint effect by tracking the actual painted
regions per window to determine whether the painted area intersects with
one of the thumbnails.
M +8 -1 kwin/effects/thumbnailaside/thumbnailaside.cpp
M +2 -0 kwin/effects/thumbnailaside/thumbnailaside.h