2003-04-01  Mark McLoughlin  <mark@skynet.ie>

        Fix long standing bug where size changes affected applet
        positions. E.g. make the panel bigger then smaller and
        there used to be gaps between all your launchers, changing
        the font size used to move the clock applet, adding an
        icon to the notification area and then removing it caused
        it to change position etc.

        * panel-widget.h: add another member to AppletData
        which tracks the actual position as it currently
        appears on the panel. AppletData:pos now corresponds
        to the user specified position as opposed to the
        constrained position.

        * panel-widget.c:
        (emit_applet_moved): impl.
        (panel_widget_cremove): fixup.
        (panel_widget_is_applet_stuck): re-write for clarity.
        (get_size_from_hints): respect the min_cells hint here.
        (allocate_dirty_child): use the constrained applet position
        and don't do any actual moving.
        (panel_widget_switch_applet_right),
        (panel_widget_switch_applet_left),
        (panel_widget_get_right_switch_pos),
        (panel_widget_get_left_switch_pos), (panel_widget_switch_move),
        (push_applet_right), (push_applet_left), (panel_widget_push_move),
        (panel_widget_right_stick): use the constrained position when
        figuring out where to move things and emit the moved signal at
        when applets have been moved.
        (panel_widget_size_allocate): don't make size changes affect
        the user specified position. Also don't saze the constrained
        position.
        (panel_widget_applet_drag_start_no_grab), (walk_up_to),
        (is_in_applet), (panel_widget_get_free_spot): upd. to use the
        constrained position as appropriate.
        (panel_widget_nice_move): emit the moved signal.
        (panel_widget_applet_move_to_cursor),
        (panel_widget_add): use the constrained positionl.
        (panel_widget_reparent): emit the moved signal.