Review Request: Recalculate desktop size in kephal

[Beat Wolf]

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http://reviewboard.kde.org/r/4522/
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Review request for Plasma.


Summary
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Recalculate the current desktop size in kephal and don't trust QDesktopwidget on that one.
Solves an issue that the current desktop size is wrong just after the screen added signal has been received.

Solves the bug in pager where the aspect ratio is not changed correctly when adding and removing a screen.

Of course cashing could be done, but since there are usualy only 1-2 screens and that method is not used often, it should be just fine like that.

PS: the withespace thing will be corrected when i commit


Diffs
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  trunk/KDE/kdebase/workspace/libs/kephal/kephal/screens.cpp 1146308 

Diff: http://reviewboard.kde.org/r/4522/diff


Testing
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Tested with a second screen


Thanks,

Beat

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