2004-01-13  Michael Natterer  <mitch@gimp.org>

	Allow invoking the text tool by double clicking a text layer in
	the layers dialog, just like the path tool is invoked when double
	clicking a path.

	* app/tools/gimptexttool.[ch]: added empty
	gimp_text_tool_set_layer() stub. Sven, your turn...

	* app/gui/layers-commands.[ch]: added layers_text_tool() which
	invokes the text tool on text layers and falls back to
	layers_edit_layer_query() otherwise.
	Added layers_text_tool_cmd_callback() for the layers menu.

	* app/gui/layers-menu.c: added "Text Tool" menu item and hide
	it for layers which are no text layers.

	* app/gui/dialogs-constructors.c (dialogs_layer_list_view_new):
	use layers_text_tool() as "activate" function.