Review Request: Fix folderview sorting

[Ignat Semenov]

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http://git.reviewboard.kde.org/r/103895/
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Review request for Plasma, Aaron J. Seigo, Marco Martin, Peter Penz, and Fredrik Höglund.


Description
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This patch fixes the inconsistent sorting issues in FolderView.

1)It introduces explicit support for sorting by size. Prior to the change, sorting by Size was done as follows:convert the size into a string and use KStringHandler::naturalCompare(). Of course, this is not the same as a proper int comparison - FW sorted incorrectly by size.
2)Introduce one important concept:fallback to comparing the name if the main sorting column is not enough to determine a sort order. This is especially important for sorting by type - sorting by size needs this as well, but different files are way less likely to have the same size compared to the possibility of them having similar types.
3)Intoduce full three-level fallback for ensuring file name uniqueness, taken from Dolphin code. Thanks a bunch goes to Peter Penz :)
4)And of course, sort folders by the child count if sorting by size. Again, Dolphin inspired.


Diffs
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  plasma/applets/folderview/proxymodel.cpp 4b3340e 

Diff: http://git.reviewboard.kde.org/r/103895/diff/diff


Testing
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Tested, yields results similar to Dolphin sorting of the same folder (surpise! :) ).


Thanks,

Ignat Semenov

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