Review Request: Restore ability to select a groups of files in Dolphin by clicking a group title

[Todd]

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http://reviewboard.kde.org/r/2764/
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Review request for Dolphin and kdelibs.


Summary
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This patch restores the ability to select a group of files in Dolphin by clicking on the group's title.  This is a feature regression between 4.3 and 4.4  Unlike the original version, which could only select groups, this implementation allows for selecting and deselecting groups (Peter Penz said he considered the lack of deselecting to be a bug).  

The patch also removes a workaround in Dolphin that does not appear to be necessary anymore and was preventing the group selection from working.  

I know this is probably not the prettiest solution, but it does work.  I made a couple of speed improvements in corner cases, which should be clear from the diff, but these could be removed without altering the functionality of the code.  I am open to suggestions on improvements.  I would also appreciate it if other people tested it as well.


This addresses bug 214859.
    https://bugs.kde.org/show_bug.cgi?id=214859


Diffs
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  /trunk/KDE/kdebase/apps/dolphin/src/dolphiniconsview.cpp 1082212 
  /trunk/KDE/kdelibs/kdeui/itemviews/kcategorizedview.h 1082212 
  /trunk/KDE/kdelibs/kdeui/itemviews/kcategorizedview.cpp 1082212 
  /trunk/KDE/kdelibs/kdeui/itemviews/kcategorizedview_p.h 1082212 

Diff: http://reviewboard.kde.org/r/2764/diff


Testing
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Selected and deselected groups in Dolphin under various circumstances.


Thanks,

Todd