Public bug reported:
When using the KDE desktop for a certain amount of time (seems random),
the window decoration in the top-left corner starts for flicker for the
active application. The flickering remains when the application loses
focus, so more and more decorations will flicker.
The flicker
You have been subscribed to a public bug:
When using the KDE desktop for a certain amount of time (seems random),
the window decoration in the top-left corner starts for flicker for the
active application. The flickering remains when the application loses
focus, so more and more decorations will
