Blinking window frame

Submitted by Khazar

Assigned to Simon Steinbeiß @ochosi

Link to original bug (#12147)

Description

1. Place xfce4-panel to edge of screen (anywhere, horizontal or vertical).
2. Activate Draw window frame when hovering a button (Window Button > Behaviour).
3. Open a software that have a full screen mode (e.g. Liferea or QupZilla).
4. Minimize the full screened application.
5. Hover cursor on the full screened application button.
6. Window frame blinks and causes higher CPU consumption.

Version: 4.10.1