Smaller KDialogs if needed

[Albert Astals Cid]

KDialog uses the mainwidget sizeHint to calculate it's minimumSizeHint, this 
results in BIG KDialogs and bad situations like for example 
	$ keditfiletype text/html
not fitting in a 1024x768 screen.

The attached patch first uses sizeHint and if the calculated minimumSizeHint 
is bigger than 90% of available screen rect recalculates the minimumSizeHint 
using children's minimumSizeHint.

That gives me a keditfiletype that fits nicely in a 1024x768 screen.

Comments?

Albert
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