[PATCH for bug:50902] icon rows' top margins not updated until all previews are generated

[Luis Pedro Coelho]

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Hello,

[ relevant link: http://bugs.kde.org/show_bug.cgi?id=50902 ]

Below is a patch for bug 50902. It rearranges the icons whenever it is needed, 
but it doees so with a small delay (ie, no more than two rearrangement per 
second) so as not to have too much flicker.

It seems to work ok (not really optimal: but a balance must be struck: too 
fast updates and it flickers, too slow and it is, well, too slow) in both 
fast thumbnail (from cache) and slow (large images not cached).

Ok to commit?
- -- 
Luis Pedro Coelho

On user interfaces and languages, see:
http://luispedro.journalspace.com/

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