2008-07-12  Martin Nordholts  <martinn@svn.gnome.org>

	The following change is conceptually based on a patch by
	Alexia Death and implements the core functionality for
	bug #362915.

	* app/display/gimpdisplayshell-scroll.[ch]
	(gimp_display_shell_scroll_clamp_offsets): Clamp the offsets in
	such a way that allows to scroll beyond the image border.

	(gimp_display_shell_setup_hscrollbar_with_value)
	(gimp_display_shell_setup_vscrollbar_with_value): Put common
	scrollbar range setup code here.

	* app/display/gimpdisplayshell-scale.c
	(gimp_display_shell_scale_setup): Use above helper functions for
	setting up scrollbar range.

	* app/display/gimpdisplayshell-callbacks.c: Handle adjustment of
	the scrollbar range when they are about to change value.

	* app/display/gimpdisplayshell.c: Always keep the scrollbar
	steppers sensitive to user input.

svn path=/trunk/; revision=26166