Fix dialog spam when inspecting MeshInstance from model file

Avoid load_scene for built-in resources to make sure we don't
open a scene tab and prompt for model file editing.

Load scene as regular resource instead and store the reference to keep
the dependency until the remote inspector cache is cleared.

(cherry picked from commit 01802074a01c41d8672664751f80b80069796f12)

editor/script_editor_debugger.cpp

@@ -646,12 +646,9 @@ void ScriptEditorDebugger::_parse_message(const String &p_msg, const Array &p_da
 					if (path.find("::") != -1) {
 						// built-in resource
 						String base_path = path.get_slice("::", 0);
-						if (ResourceLoader::get_resource_type(base_path) == "PackedScene") {
-							if (!EditorNode::get_singleton()->is_scene_open(base_path)) {
-								EditorNode::get_singleton()->load_scene(base_path);
-							}
-						} else {
-							EditorNode::get_singleton()->load_resource(base_path);
+						RES dependency = ResourceLoader::load(base_path);
+						if (dependency.is_valid()) {
+							remote_dependencies.insert(dependency);
 						}
 					}
 					var = ResourceLoader::load(path);
@@ -2144,6 +2141,7 @@ void ScriptEditorDebugger::_clear_remote_objects() {
 		memdelete(E->value());
 	}
 	remote_objects.clear();
+	remote_dependencies.clear();
 }
 
 void ScriptEditorDebugger::_clear_errors_list() {

editor/script_editor_debugger.h

@@ -100,6 +100,7 @@ private:
 	ObjectID inspected_object_id;
 	ScriptEditorDebuggerVariables *variables;
 	Map<ObjectID, ScriptEditorDebuggerInspectedObject *> remote_objects;
+	Set<RES> remote_dependencies;
 	Set<ObjectID> unfold_cache;
 
 	VBoxContainer *errors_tab;