2007-11-15  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpviewable.[ch]: add read-only property "frozen" and
	new API gimp_viewable_preview_is_fozen(). Emit property notifications.

	* app/widgets/gimphistogramview.[ch]: add API to show a second
	histogram in the background. Remove member "light_histogram" from
	the GimpHistogramViewClass struct.

	* app/widgets/gimpcurveview.c: don't set "light_histogram".

	* app/tools/gimpcurvestool.c: set the background histogram instead.

	* app/widgets/gimphistogrameditor.[ch]: connect to "notify::frozen"
	of the drawable and show its histogram at the freezing point in
	the background. This way the original histogram is visible while
	we are doing color corrections.


svn path=/trunk/; revision=24158