Review Request: recycle unused containments if possible when assigning them to views

[Marco Martin]

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http://reviewboard.kde.org/r/338/
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Review request for Plasma.


Summary
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this adds findFreeContainment that founds the first unused desktop containment by any view, so checkScreen uses it instead of creating a new one every time.
so it's possible when switching to pervirtualdesktopviews to recycle unused stuff instead of creating 3 new containments everytime, important if it will be supported (as the preliminary patch i did) to switch on the fly to that mode while plasma is running.
it could be used also to implement the support to the deletion of the active desktop containment


Diffs
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  /trunk/KDE/kdebase/workspace/plasma/shells/desktop/desktopcorona.h 938681 
  /trunk/KDE/kdebase/workspace/plasma/shells/desktop/desktopcorona.cpp 939686 

Diff: http://reviewboard.kde.org/r/338/diff


Testing
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Thanks,

Marco