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Michael Natterer authored
- get rid of the individual undo types and add GIMP_UNDO_ITEM_REORDER. - replace the pushing functions by a single one. - merge all the actual undo code into gimpitempropundo.[ch]. - use gimp_item_tree_reorder_item() to do the actual reordering. - fix gimp_item_tree_reorder_item() to use an ordinary "push_undo" boolean again instead of a pointer to an undo function. GimpVectorsPropUndo is now a completely empty skeleton. Keep it around anyway, maybe we'll get vectors properties to undo soon.
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