Activity switching on window activation

[Kai Uwe Broulik]

Hi,

> ‎instead of automatically switching to that activity, we
might show a notification 'blah blah is open in blah blah activity'
with a button to switch to it.

I like that. Nonetheless we should fix applications where we can (KDE Applications) to have them (Kate for instance supports multiple windows) spawn a new window on the current activity, perhaps with some way to merge them back together if you switch over, even.

Cheers,
Kai Uwe