https://bugs.kde.org/show_bug.cgi?id=356804

            Bug ID: 356804
           Summary: Breeze Task Switcher fails to visually highlight some
                    windows' thumbnails while tabbing through
           Product: plasmashell
           Version: 5.4.3
          Platform: Debian testing
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: k...@davidedmundson.co.uk
          Reporter: db0...@gmail.com
                CC: bhus...@gmail.com, plasma-b...@kde.org

I've got the Switcher set to Breeze them with the usual Alt-Tab as the main
shortcut. When pressing this, the pane appears on the left with thumbnails of
windows oriented vertically. One of these is highlighted by a box (in my case a
light blue colour) as you tab through.

However, certain thumbnails do NOT get highlighted - the highlight box stays on
the previous window. But, if I release Alt on the window I just (blindly)
tabbed to, it then gets focussed as normal. Showing that it _is_ being
'selected' - but not properly visually highlighted to indicate this.

Also, when the selection has moved to a new thumbnail where the highlight
erroneously isn't showing - if I keep Alt held and move my mouse cursor over
the now (invisibly) selected thumbnail, the highlight box then moves to there
where it should have been all along.

Please let me know if I can provide any relevant details to get this resolved.

Reproducible: Always

Steps to Reproduce:
1. Set Task Switcher to Breeze them and open a bunch of windows
2. Press Alt+Tab multiple times and notice that certain windows are not
highlighted when they are selected by the Switcher
3. Releasing Alt gives the right window focus, showing that the window is being
selected, just invisibly - though by moving your mouse cursor over the
thumbnail, it gets highlighted properly as it should have been

Actual Results:  
Certain windows are not highlighted (without manually moving the mouse cursor
over them, clearly not useful behaviour)

Expected Results:  
All windows should be highlighted when selected, as with any other
task-switching widget

Happy to provide any relevant logs etc if required. Can probably record a video
if absolutely necessary though I hope this is reproducible enough.

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