Review Request: add pager drag switch feature back

[Xuetian Weng]

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http://git.reviewboard.kde.org/r/107843/
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Review request for kde-workspace, Plasma and Aaron J. Seigo.


Description
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when porting to qml this feature lost. this add the feature back, code is mostly the old one, with some clean up


This addresses bug 310475.
    http://bugs.kde.org/show_bug.cgi?id=310475


Diffs
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  plasma/desktop/applets/pager/pager.h 767b2dd 
  plasma/desktop/applets/pager/pager.cpp 956bde2 

Diff: http://git.reviewboard.kde.org/r/107843/diff/


Testing
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tested, no problem.


Thanks,

Xuetian Weng

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