taskbar / dualhead / only from current screen

[Sebastian Kügler]

Hi,

I'm debugging https://bugs.kde.org/show_bug.cgi?id=233054

The problem is that the "show only tasks from current screen"
 gets messed up when you move the taskbar from one screen to another. This 
seems to be related to the Plasma::ScreenConstraint. This one is emitted when 
an applet is moved from one screen to another. It does *NOT* get emitted (or 
reach the tasks applet, anyway) when a panel is moved between screens, so the 
applet shows the wrong tasks after moving.

I'm not enough into how the panel and constraintsevents work, but I thought 
someone here might be able to hint me at the right piece of code, or goes "Ow, 
but that one's easy to fix".

Cheers,
-- 
sebas

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