Version: (using Devel) Installed from: Compiled sources OS: Linux Taskbar thumbnails appear before they are moved which causes an ugly flashing effect. To reproduce: Show a thumbnail on the far left of the panel, then hide it by moving onto the desktop. Then show a thumbnail on the far right of the taskbar, you will see the original thumbnail appear then disappear.
the problem is in the function void ToolTip::showToolTip() that moves the tooltip after being shown, the problem is if you move the tooltip before it's shown it causes graphical artifacts with composite turned off (and maybe misplacements?)
fixed in revision 773744