2003-02-27  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpviewable.[ch]: added virtual function
	get_popup_size() which returns a boolean indicating if a popup is
	needed and its size.

	* app/core/gimpbrush.c
	* app/core/gimpbrushpipe.c
	* app/core/gimpbuffer.c
	* app/core/gimpdrawable-preview.[ch]
	* app/core/gimpdrawable.c
	* app/core/gimpgradient.c
	* app/core/gimpimage.c
	* app/core/gimppalette.c
	* app/core/gimppattern.c
	* app/core/gimpundo.c: implement it.

	* app/widgets/gimppreview.[ch]: removed virtual functions
	needs_popup() and create_popup(). Removed the code which creates
	the popup and the popup members of the GimpPreview struct.

	* app/widgets/gimppreview-popup.[ch]: new files providing the
	utility function gimp_preview_popup_show() which can show popups
	from any widget, not just from a GimpPreview. Checks if a popup is
	needed using gimp_viewable_get_popup_size().

	* app/widgets/gimpcellrendererviewable.c: show popups here too.

	* app/widgets/gimpbrushpreview.c
	* app/widgets/gimpbufferpreview.c
	* app/widgets/gimpdrawablepreview.c
	* app/widgets/gimpimagepreview.c: removed needs_popup() and
	create_popup() implementations.

	* app/widgets/gimpnavigationpreview.c: removed empty render()
	implementation.

	* app/widgets/gimpundoeditor.c: use a tree instead of a list view.

	* app/widgets/gimpgradientpreview.[ch]
	* app/widgets/gimppalettepreview.[ch]
	* app/widgets/gimppatternpreview.[ch]: removed because they only
	implemented the removed popup functions.

	* app/widgets/Makefile.am
	* app/widgets/widgets-types.h
	* app/widgets/gimpmenuitem.c
	* app/widgets/gimppreview-utils.c: changed accordingly