2006-02-19  Murray Cumming  <murrayc@murrayc.com>

        * glom/utility_widgets/imageglom.cc:
        * glom/utility_widgets/imageglom.h: Overried on_expose_event() so we can
        scale the image when we actually have a real (>1) allocation.
        scale(): Do not call set_image() if the scaled pixbuf has exactly the same
        dimensions as the existing image. And do not try to scale the image if the
        allocation is very small, because this will generally fail. This fixes the
        disappearing image problem.