Bug 501735

SUMMARY

There's an inactive border around thumbnails that appear when you hover over a running app in the bottom dock/taskbar. This results in a flash of the full desktop when moving the mouse over the thumbnails.


STEPS TO REPRODUCE
1. Open an app that supports multiple windows (e.g., Firefox)
2. Open multiple windows
3. Hover the mouse over the app's icon in the taskbar/dock
4. Wait for the thumbnails of the app's open windows to appear immediately above the icon
5. Move the mouse up, to one of the thumbnails.
6. All other windows on the screen are temporarily hidden, showing just the window represented by the thumbnail
7. Move the mouse left or right, to one of the other thumbnails

OBSERVED RESULT

As you move the mouse left or right there is a padding/margin/border area around each thumbnail. When the mouse moves in to this area all the windows on the desktop are shown.

When the mouse moves out of this area and into the next thumbnail all the windows on the desktop are hidden again except for the window represented by the thumbnail.

This leads to a lot of window flashing.

EXPECTED RESULT

There is no effective border between the thumbnails so that moving the mouse between them does not briefly show all other windows on the desktop.

SOFTWARE/OS VERSIONS

Operating System: Kubuntu 24.10
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.6.2
Kernel Version: 6.11.0-19-generic (64-bit)
Graphics Platform: Wayland