2004-10-24  Michael Natterer  <mitch@gimp.org>

	* app/widgets/gimpgradienteditor.[ch]
	* app/widgets/gimppaletteeditor.[ch]: added public APIs for
	zooming the editors. Use gimp_editor_add_action_button() to create
	all buttons. Removed all button callbacks and all duplicated
	button sensitivity logic.

	* app/widgets/gimpdataeditor.c (gimp_data_editor_set_data): update
	the editor's UI manager if it exists.

	* app/actions/gradient-editor-actions.c
	* app/actions/gradient-editor-commands.[ch]: added zoom actions
	and callback and call gimp_gradient_editor_zoom(). Fixed
	gradient_editor_actions_update() to actually set all items'
	sensitivity (it was possible to modify read-only gradients and
	even to crash GIMP).

	* app/actions/palette-editor-actions.c
	* app/actions/palette-editor-commands.[ch]: changed "new" and
	"zoom" actions to actually do their job instead of calling
	gtk_button_clicked(editor->foo_button).