New setter function so that we can make the "gboolean dnd_drop_to_empty"
* app/widgets/gimpcontainertreeview.[ch] (gimp_container_tree_view_set_dnd_drop_to_empty): New setter function so that we can make the "gboolean dnd_drop_to_empty" class instance member private. * app/widgets/gimpcontainertreeview-private.h: Move member here. * app/widgets/gimpcontainertreeview-dnd.c: Go through priv pointer. * app/widgets/gimpitemtreeview.c (gimp_item_tree_view_init): Use the new function. svn path=/trunk/; revision=27671
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