Comment 5 for bug 687567

I looked into this, it's the fade animation on close being slowed by something inside Unity. Even if I stop emitting the signals that tell the panel to repaint itself, this still happens, so it's not dbus-traffic or anything like that causing it.

If I switch off the animation plugin, then the effect is greatly reduced, however then you can still sometimes see the shadow of the of menu hang around a bit longer than necessary.

If I was going to guess, it looks like either there is a repaint going on in Compiz just before the menu goes away, which causes the next paint to use an invalid TFP and hence we see white (i.e. the menu closes before the animation plugin has time to take a snapshot, or we're causing an extra paint before the plugin is ready).

I'm going to assign to sam as I need his input on this. Also, moving to next week as he as quite a bit on his plate this week.