[poppler] thumbnails

[Pino Toscano]

Hi,

I reviewed, polished and pushed your patch, thanks!
There were few quirks, but mostly small things (like indentation).

> So far the thumbnail images seem to be 24-bit RGB; I don't know if
> that's always going to be true.

For now I left this assumption; but it should be checked which format is 
actually returned by Page::loadThumb(), and in case fill the QImage by 
adapting the input data.

> I tested it by modifying the demo program to have a thumbnails dock
> window, using the usual QTableView, which isn't so great because
> QIcons in a QTableView are a rather tiny size by default, but at least
> you can see that the thumbnails got generated correctly.  I will try
> to use a QGraphicsView in my own program for that.

I changed that by making use of QListWidget for it, should looks better now.
Most probably can be improved, but at least as first approach works ;)

Keep up the good work!
-- 
Pino Toscano
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