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Michael Natterer authored
* app/xcf/xcf-private.h: add properties PROP_GROUP_ITEM and PROP_ITEM_PATH * app/xcf/xcf-save.c: when saving a group layer, save a PROP_GROUP_ITEM. When saving a child item, save a PROP_ITEM_PATH which contains the path indices returned by gimp_item_get_path(). * app/xcf/xcf-load.c: when loading a PROP_GROUP_ITEM, replace the layer that is being loaded by a GimpGroupLayer, also ignore that layer's hierarchy (it makes no sense to load the tiles of a layer that's generated from its children). When loading a PROP_ITEM_PATH, pass the loaded path up to xcf_load_image() so it can add the loaded layer at the right place in the tree.
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