Changed various editor transform operations to be committed in local instead of global space. Fixed a couple of bugs when syncing transforms to debug instance.

editor/plugins/canvas_item_editor_plugin.cpp

@@ -5775,7 +5775,11 @@ void CanvasItemEditorViewport::_create_nodes(Node *parent, Node *child, String &
 
 	// there's nothing to be used as source position so snapping will work as absolute if enabled
 	target_position = canvas_item_editor->snap_point(target_position);
-	undo_redo->add_do_method(child, "set_global_position", target_position);
+
+	CanvasItem *parent_ci = Object::cast_to<CanvasItem>(parent);
+	Point2 local_target_pos = parent_ci ? parent_ci->get_global_transform().xform_inv(target_position) : target_position;
+
+	undo_redo->add_do_method(child, "set_position", local_target_pos);
 }
 
 bool CanvasItemEditorViewport::_create_instance(Node *parent, String &path, const Point2 &p_point) {

editor/plugins/node_3d_editor_plugin.cpp

@@ -3295,8 +3295,10 @@ void Node3DEditorViewport::_menu_option(int p_option) {
 					xform.basis.rotate_local(Vector3(1, 0, 0), Math_TAU * 0.25);
 				}
 
-				undo_redo->add_do_method(sp, "set_global_transform", xform);
+				Node3D *parent = sp->get_parent_node_3d();
-				undo_redo->add_undo_method(sp, "set_global_transform", sp->get_global_gizmo_transform());
+				Transform3D local_xform = parent ? parent->get_global_transform().inverse_xform(xform) : xform;
+				undo_redo->add_do_method(sp, "set_transform", local_xform);
+				undo_redo->add_undo_method(sp, "set_transform", sp->get_local_gizmo_transform());
 			}
 			undo_redo->commit_action();
 
@@ -4362,16 +4364,7 @@ bool Node3DEditorViewport::_create_instance(Node *parent, String &path, const Po
 
 	Node3D *node3d = Object::cast_to<Node3D>(instantiated_scene);
 	if (node3d) {
-		Transform3D gl_transform;
+		undo_redo->add_do_method(instantiated_scene, "set_transform", node3d->get_transform());
-		Node3D *parent_node3d = Object::cast_to<Node3D>(parent);
-		if (parent_node3d) {
-			gl_transform = parent_node3d->get_global_gizmo_transform();
-		}
-
-		gl_transform.origin = preview_node_pos;
-		gl_transform.basis *= node3d->get_transform().basis;
-
-		undo_redo->add_do_method(instantiated_scene, "set_global_transform", gl_transform);
 	}
 
 	return true;
@@ -4607,8 +4600,8 @@ void Node3DEditorViewport::commit_transform() {
 			continue;
 		}
 
-		undo_redo->add_do_method(sp, "set_global_transform", sp->get_global_gizmo_transform());
+		undo_redo->add_do_method(sp, "set_transform", sp->get_local_gizmo_transform());
-		undo_redo->add_undo_method(sp, "set_global_transform", se->original);
+		undo_redo->add_undo_method(sp, "set_transform", se->original_local);
 	}
 	undo_redo->commit_action();
 
@@ -6168,8 +6161,10 @@ void Node3DEditor::_xform_dialog_action() {
 			tr.origin += t.origin;
 		}
 
-		undo_redo->add_do_method(sp, "set_global_transform", tr);
+		Node3D *parent = sp->get_parent_node_3d();
-		undo_redo->add_undo_method(sp, "set_global_transform", sp->get_global_gizmo_transform());
+		Transform3D local_tr = parent ? parent->get_global_transform().inverse_xform(tr) : tr;
+		undo_redo->add_do_method(sp, "set_transform", local_tr);
+		undo_redo->add_undo_method(sp, "set_transform", sp->get_transform());
 	}
 	undo_redo->commit_action();
 }
@@ -7518,8 +7513,10 @@ void Node3DEditor::_snap_selected_nodes_to_floor() {
 					new_transform.origin.y = result.position.y;
 					new_transform.origin = new_transform.origin - position_offset;
 
-					undo_redo->add_do_method(sp, "set_global_transform", new_transform);
+					Node3D *parent = sp->get_parent_node_3d();
-					undo_redo->add_undo_method(sp, "set_global_transform", sp->get_global_transform());
+					Transform3D new_local_xform = parent ? parent->get_global_transform().inverse_xform(new_transform) : new_transform;
+					undo_redo->add_do_method(sp, "set_transform", new_local_xform);
+					undo_redo->add_undo_method(sp, "set_transform", sp->get_transform());
 				}
 			}
 

scene/debugger/scene_debugger.cpp

@@ -630,7 +630,34 @@ void LiveEditor::_node_set_func(int p_id, const StringName &p_prop, const Varian
 		}
 		Node *n2 = n->get_node(np);
 
+		// Do not change transform of edited scene root, unless it's the scene being played.
+		// See GH-86659 for additional context.
+		bool keep_transform = (n2 == n) && (n2->get_parent() != scene_tree->root);
+		Variant orig_tf;
+
+		if (keep_transform) {
+			if (n2->is_class("Node3D")) {
+				orig_tf = n2->call("get_transform");
+			} else if (n2->is_class("CanvasItem")) {
+				orig_tf = n2->call("_edit_get_state");
+			}
+		}
+
 		n2->set(p_prop, p_value);
+
+		if (keep_transform) {
+			if (n2->is_class("Node3D")) {
+				Variant new_tf = n2->call("get_transform");
+				if (new_tf != orig_tf) {
+					n2->call("set_transform", orig_tf);
+				}
+			} else if (n2->is_class("CanvasItem")) {
+				Variant new_tf = n2->call("_edit_get_state");
+				if (new_tf != orig_tf) {
+					n2->call("_edit_set_state", orig_tf);
+				}
+			}
+		}
 	}
 }
 
@@ -674,8 +701,35 @@ void LiveEditor::_node_call_func(int p_id, const StringName &p_method, const Var
 		}
 		Node *n2 = n->get_node(np);
 
+		// Do not change transform of edited scene root, unless it's the scene being played.
+		// See GH-86659 for additional context.
+		bool keep_transform = (n2 == n) && (n2->get_parent() != scene_tree->root);
+		Variant orig_tf;
+
+		if (keep_transform) {
+			if (n2->is_class("Node3D")) {
+				orig_tf = n2->call("get_transform");
+			} else if (n2->is_class("CanvasItem")) {
+				orig_tf = n2->call("_edit_get_state");
+			}
+		}
+
 		Callable::CallError ce;
 		n2->callp(p_method, p_args, p_argcount, ce);
+
+		if (keep_transform) {
+			if (n2->is_class("Node3D")) {
+				Variant new_tf = n2->call("get_transform");
+				if (new_tf != orig_tf) {
+					n2->call("set_transform", orig_tf);
+				}
+			} else if (n2->is_class("CanvasItem")) {
+				Variant new_tf = n2->call("_edit_get_state");
+				if (new_tf != orig_tf) {
+					n2->call("_edit_set_state", orig_tf);
+				}
+			}
+		}
 	}
 }