MISC-41: KDE Pager Misbhehaviour: Clicking Virtual Desktops moves windows

It's hard to describe the behaviour really, particularly as it's so inconsistent, so prior to trying anything to fix the issue, I've made a video - https://videos.bentasker.co.uk/Player.html?url=2020/20200724_kde_pager_misbehaviour/kde_pager_misbehaviour.mp4.m3u8

Running kwin --replace makes no difference to the behaviour. Not too surprising as it wasn't too likely to be a window manager issue

Restarting Plasma though, does resolve it

killall plasmashell
kstart plasmashell

With the advantage that all my work/windows are left open (unlike rebooting)

Watching the video again, it's almost like it's a feature - when I click on the other desktop there's a rectangle there representing a window. Looks like it's that window which comes across.

I wonder if there's some keyboard shortcut I've knocked to activate that functionality, although nothing shows in the pager settings

The Plasma documentation - https://userbase.kde.org/Plasma/Pager - doesn't seem to mention anything about a feature like this, though it is fairly limited (and possibly out of date)

Glancing at the source, it is possible to drag windows between the desktops within the pager - https://github.com/KDE/plasma-desktop/blob/master/applets/pager/package/contents/ui/main.qml#L93 - doing that doesn't repro the behaviour though.

The existence of the functionality, though supports the theory that this "bug" is actually it getting stuck in a feature. Whatever the trigger/shortcut is, I can't seem to find it to repro.

It's not

- Dragging windows between the desktops in the pager
- Clicking the mouse wheel in the pager
- Clicking and scrolling the wheel in the pager
- Double clicking in the pager
- Dragging a window from the taskbar to another pager

:shrug: the main thing is now know how to kill the behaviour - restart plasmashell