DocumentSwitcherPluging are broken by workingsets

[Andreas Pakulat]

Hi,

See https://bugs.kde.org/show_bug.cgi?id=197870

It seems that the introduction of workingsets breaks some of the
assumption that the documentswitcherplugin has (at least thats the only
way I can see that view->document() returns a broken pointer). At least
it seems that the list of views it keeps isn't properly updated when a
workingset hides itself.

As I have absolutely 0 idea how the workingset stuff is implemented, I'm
going to need some help to fix that one. Currently the plugin is
notified when a new mainwindow is added and on each mainwindow it
connects to these signals:

areaChanged
activeViewChanged
viewAdded
aboutToRemoveView

so its notified whenever the current view changes and when the area
changes. I'm guessing that I'll need a new signal to connect to when the
workingset is changed, which one? 

Also what consequences does disabling a workingset have, i.e. does it
close all connected documents? Does it just remove all views? If the
latter why is aboutToRemoveView never emitted.

Andreas

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