Wallpaper Image Preview Dialog

I was playing with the image preview dialog and noticed that it always 
defaults to a dialog size of about 218 x 657. Now this is not a 
significant problem, but in order to use the window, one either has to 
manually stretch it or press maximize. This initial behavior is due to 
the window being fitted to the outer sizer. I commented that out and 
put in a fixed size of 800 x 700 when the dialog is created. This seems 
to be about the size of a square and one can start to use it right 
away.

This happens on both Windows and on the Mac. Pics and diff included 
(Mac pics only).

Thanks,

Adit