Review Request: minimize listview item weird placement in widget explorer

[Reza Shah]

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http://git.reviewboard.kde.org/r/105544/
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Review request for Plasma and Marco Martin.


Description
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Background:
There is a bug in widget explorer regarding item placement in listview, which give bad visual placement.
Seems there is bug in qml listview. This patch tries to minimize the bad visual effect.

You can try to reproduce this by doing some searching using certain keyword to display list of plasmoid with combination of wheel scrolling, 
like below:
- use 'dev'
- use 'de'
- try wheel scrolling


Marco, after several trying, i think this patch has less bug while preserving little animation.


Diffs
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  libs/plasmagenericshell/widgetsexplorer/kcategorizeditemsviewmodels.cpp 500e6ff 
  libs/plasmagenericshell/widgetsexplorer/package/contents/ui/AppletDelegate.qml 98a7560 

Diff: http://git.reviewboard.kde.org/r/105544/diff/


Testing
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tested against master


Thanks,

Reza Shah

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