2004-09-21 Michael Natterer <mitch@gimp.org>
For the sake of completeness, added a GUI for the hidden
"Open as Layer" feature:
* app/actions/file-actions.c
* app/actions/file-commands.[ch]: added "file-open-as-layer"
action and callback. Abuse the "gimage" field of GimpFileDialog to
indicate layer opening (it's otherwise unused for file-open).
* app/dialogs/file-open-dialog.c: if dialog->gimage is non-NULL,
open the selected files as layers for that image.
* app/widgets/gimphelp-ids.h: added GIMP_HELP_FILE_OPEN_AS_LAYER.
* menus/image-menu.xml.in: added it to the menu.