2008-07-11  Martin Nordholts  <martinn@svn.gnome.org>

	* app/display/gimpdisplayshell-scroll.c
	(gimp_display_shell_get_scaled_image_viewport_offset): New
	function to replace any occurance of

	  shell->disp_[xy]offset - shell->offset_[xy]

	that is just an implementation specific way of saying the same
	thing.

	* app/display/gimpdisplayshell-draw.c
	* app/display/gimpdisplayshell-transform.c: Make the code less
	implementation dependant by using the new function.

svn path=/trunk/; revision=26137