feat(studio,stacking,animations,collections): M16 ModBison Studio, object stacking, model animations, and poly collections for MVP 2

scripts/editor/tools/transform_tool.gd

@@ -27,8 +27,28 @@ func apply(core: EditorCore, args: Dictionary) -> Variant:
 
 	match op:
 		"move":
-			return _apply_vector3(core, object_id, args.get("value", obj.position),
-				obj.position, "Move", core.model.set_object_position_raw)
+			var new_val: Vector3 = args.get("value", obj.position)
+			var old_val: Vector3 = obj.position
+			var delta: Vector3 = new_val - old_val
+			if new_val.is_equal_approx(old_val):
+				return false
+			var children_snapshots: Array = []
+			for child in core.model.payload.objects:
+				if child.properties is Dictionary and child.properties.get("parent_id") == object_id:
+					children_snapshots.append({"id": child.id, "old_pos": child.position, "new_pos": child.position + delta})
+			core.undo_redo.begin("Move '%s'" % object_id)
+			core.undo_redo.add_do(func():
+				core.model.set_object_position_raw(object_id, new_val)
+				for cs in children_snapshots:
+					core.model.set_object_position_raw(cs["id"], cs["new_pos"])
+			)
+			core.undo_redo.add_undo(func():
+				core.model.set_object_position_raw(object_id, old_val)
+				for cs in children_snapshots:
+					core.model.set_object_position_raw(cs["id"], cs["old_pos"])
+			)
+			core.undo_redo.commit()
+			return true
 		"rotate":
 			return _apply_vector4(core, object_id, args.get("value", obj.rotation),
 				obj.rotation, "Rotate", core.model.set_object_rotation_raw)