Review Request: make KFileWidget keep current extension if possible

[Martin Koller]

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http://git.reviewboard.kde.org/r/102986/
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Review request for kdelibs.


Description
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In trying to fix mentioned bug, I found out the original problem lies in KFileWidget:
If I'm editing a JPEG file which has the non-mainExtension ".jpg" and KFileWidget was told to auto-select an extension,
then it did not check if the already given extension is one which is also allowed and simply removed
".jpg" and added ".jpeg", which is not what a user would expect.

This patch now checks the current extension against all allowed extensions and if there's a match, it
keeps the current extension. Only otherwise will it add the default extension.


This addresses bug 229547.
    http://bugs.kde.org/show_bug.cgi?id=229547


Diffs
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  kfile/kfilewidget.cpp 09b86d4 

Diff: http://git.reviewboard.kde.org/r/102986/diff/diff


Testing
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Used kolourpaint with "name.jpg", "name.jpeg", "name.", "name", "name.tif", "name.tiff"


Thanks,

Martin Koller

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