Test extra_width, not extra_height, when determining whether to set

Test extra_width, not extra_height, when determining whether to set

Fri Dec 19 01:47:34 2003  Matthias Clasen  <maclas@gmx.de>

	* gtk/gtkscrolledwindow.c (gtk_scrolled_window_size_request):
	Test extra_width, not extra_height, when determining whether to
	set extra_width.  (#129647, Jan Arne Petersen)