// For tweeking operations:
// If a pair of update_undo_before and update_undo_after are called
// within a certain time limit and the creator is nonzero and equal,
// For tweeking operations:
// If a pair of update_undo_before and update_undo_after are called
// within a certain time limit and the creator is nonzero and equal,
// loads undo from the stringfile to the project
int load_undo_before(FileXML *file, uint32_t load_flags);
// loads undo from the stringfile to the project
int load_undo_before(FileXML *file, uint32_t load_flags);