Icons Layout and Previews

[Benoit Walter]

Hi,

I have tried to improve the painting of thumbnails during preview generation. 
The problem of overlapped icons has been partially adressed by updating the 
iconview every 500ms (kfileivi.cc revision 1.250). This does not really solve 
the problem because the display remains ugly while generating preview during 
500ms.
With the following patch, the icon view is updated when a new thumbnail has 
been generated, but only if the update is needed (in most cases once for each 
row). Otherwise, the icon is moved. This avoids having a messy icon layout 
during generation of thumbnails.

Possible improvement:
Update the view less frequently when the generated thumbnail is not visible.

This solution is not yet perfect and it would be great if someone could try 
the patch and give some comments.

Cheers,
Benoit.
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