Make sure to update layout, and not just CSS/RenderStyle when querying image width/height 
because, well, we do need the size. 

Fixes image data not being up-to-date on load, (#129307)
Fixes infinite loop with some forum software (#169844, #166781, most likely #165668, presuming fixed 
since no non-bt info available)

BUG:129307
BUG:169844
BUG:166781
BUG:165668

svn path=/trunk/KDE/kdelibs/; revision=853399