Review Request: three trivial fixes and one not so trivial

[Jaime Torres Amate]

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http://git.reviewboard.kde.org/r/103323/
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Review request for kdelibs and Aaron J. Seigo.


Description
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In QString AssociatedApplicationManager::application it was returning a value and then trying to connect a signal.
If my change is wrong, there are two possible things to do:
* write a comment to explain the dead code
* remove the dead code


Diffs
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  plasma/widgets/signalplotter.cpp aa132dd 
  plasma/popupapplet.cpp c363503 
  plasma/private/associatedapplicationmanager.cpp cf8bbe5 
  plasma/private/style.cpp e3449f5 

Diff: http://git.reviewboard.kde.org/r/103323/diff/diff


Testing
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Thanks,

Jaime Torres Amate

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