2003-03-01  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpbuffer.c: don't scale the preview up if the
	buffer is too small.

	* app/core/gimppattern.c: don't add a white border around the
	preview if the pattern is too small.

	* app/widgets/gimppreviewrenderer.[ch]: new object. A buffer
	that updates itself on GimpViewable changes and can render
	itself to any widget. Basically GimpPreview reduced to the
	render and draw code.

	* app/widgets/gimppreview.[ch]: removed all rendering and drawing
	code and keep a GimpPreviewRenderer instance. Connect to its
	"update" signal for queuing draws on the preview.

	* app/widgets/gimpcellrendererviewable.[ch]
	* app/widgets/gimpcontainertreeview.c: same here: removed
	rendering and drawing code and keep GimpPreviewRenderers in the
	list store.  Delays preview creation for GtkTreeViews until the
	buffer is really needed for drawing and adds idle preview updating
	on viewable changes.

	* app/widgets/gimppreview-utils.[ch]
	* app/widgets/gimpbrushpreview.[ch]
	* app/widgets/gimpbufferpreview.[ch]
	* app/widgets/gimpdrawablepreview.[ch]
	* app/widgets/gimpimagepreview.[ch]: removed...

	* app/widgets/gimppreviewrenderer-utils.[ch]
	* app/widgets/gimppreviewrendererbrush.[ch]
	* app/widgets/gimppreviewrendererdrawable.[ch]
	* app/widgets/gimppreviewrendererimage.[ch]: ...and converted to
	GimpPreviewRenderer subclasses.

	* app/display/gimpnavigationview.c
	* app/gui/palette-import-dialog.c
	* app/widgets/Makefile.am
	* app/widgets/widgets-enums.h
	* app/widgets/widgets-types.h
	* app/widgets/gimpchannellistview.c
	* app/widgets/gimpcomponentlistitem.c
	* app/widgets/gimpcontainergridview.c
	* app/widgets/gimpcontainermenuimpl.c
	* app/widgets/gimplayerlistitem.c
	* app/widgets/gimplistitem.c
	* app/widgets/gimpnavigationpreview.[ch]
	* app/widgets/gimpselectioneditor.c
	* app/widgets/gimpvectorslistview.c: changed accordingly.