Add an option to run the project upgrade tool when updating to a new Godot version

editor/editor_node.cpp

@@ -1505,6 +1505,13 @@ void EditorNode::_sources_changed(bool p_exist) {
 
 		OS::get_singleton()->benchmark_end_measure("Editor", "First Scan");
 
+		for (const String &arg : OS::get_singleton()->get_cmdline_args()) {
+			if (arg == "--run-upgrade-tool") {
+				project_upgrade_tool->prepare_upgrade();
+				return;
+			}
+		}
+
 		// Reload the global shader variables, but this time
 		// loading textures, as they are now properly imported.
 		RenderingServer::get_singleton()->global_shader_parameters_load_settings(true);

editor/project_manager/project_list.h

@@ -105,6 +105,7 @@ public:
 	void set_unsupported_features(PackedStringArray p_features);
 
 	bool should_load_project_icon() const;
+	bool is_older_version() const { return version_match_type == VersionMatchType::PROJECT_USES_OLDER_MAJOR || version_match_type == VersionMatchType::PROJECT_USES_OLDER_MINOR; }
 	void set_selected(bool p_selected, bool p_hide_focus = false);
 
 	void set_is_favorite(bool p_favorite);

editor/project_manager/project_manager.cpp

@@ -592,6 +592,10 @@ void ProjectManager::_open_selected_projects() {
 			args.push_back("--verbose");
 		}
 
+		if (ask_upgrade_tool->is_pressed()) {
+			args.push_back("--run-upgrade-tool");
+		}
+
 		Error err = OS::get_singleton()->create_instance(args);
 		if (err != OK) {
 			loading_label->hide();
@@ -632,9 +636,11 @@ void ProjectManager::_open_selected_projects_check_warnings() {
 
 	ask_update_label->set_horizontal_alignment(HORIZONTAL_ALIGNMENT_LEFT); // Reset in case of previous center align.
 	ask_update_backup->set_pressed(false);
+	ask_upgrade_tool->set_pressed(false);
 	full_convert_button->hide();
 	migration_guide_button->hide();
 	ask_update_backup->hide();
+	ask_upgrade_tool->hide();
 
 	ask_update_settings->get_ok_button()->set_text("OK");
 
@@ -681,7 +687,10 @@ void ProjectManager::_open_selected_projects_check_warnings() {
 				i--;
 			} else if (ProjectList::project_feature_looks_like_version(feature)) {
 				ask_update_backup->show();
-				migration_guide_button->show();
+				if (project.control->is_older_version()) {
+					ask_upgrade_tool->show();
+					migration_guide_button->show();
+				}
 				version_convert_feature = feature;
 				warning_message += vformat(TTR("Warning: This project was last edited in Godot %s. Opening will change it to Godot %s.\n\n"), Variant(feature), Variant(GODOT_VERSION_BRANCH));
 				unsupported_features.remove_at(i);
@@ -742,6 +751,7 @@ void ProjectManager::_open_selected_projects_with_migration() {
 	}
 #endif
 	_open_selected_projects();
+	ask_upgrade_tool->set_pressed(false);
 }
 
 void ProjectManager::_install_project(const String &p_zip_path, const String &p_title) {
@@ -1832,6 +1842,11 @@ ProjectManager::ProjectManager() {
 		ask_update_backup->set_text(TTRC("Backup project first"));
 		ask_update_backup->set_h_size_flags(SIZE_SHRINK_CENTER);
 		ask_update_vb->add_child(ask_update_backup);
+		ask_upgrade_tool = memnew(CheckBox);
+		ask_upgrade_tool->set_text(TTRC("Upgrade All Project Files"));
+		ask_upgrade_tool->set_tooltip_text(TTRC("Automatically runs the upgrade tool. This may take a while to finish. The project will be restarted once in the process."));
+		ask_upgrade_tool->set_h_size_flags(SIZE_SHRINK_CENTER);
+		ask_update_vb->add_child(ask_upgrade_tool);
 		ask_update_settings->get_ok_button()->connect(SceneStringName(pressed), callable_mp(this, &ProjectManager::_open_selected_projects_with_migration));
 		int ed_swap_cancel_ok = EDITOR_GET("interface/editor/appearance/accept_dialog_cancel_ok_buttons");
 		if (ed_swap_cancel_ok == 0) {

editor/project_manager/project_manager.h

@@ -247,6 +247,7 @@ class ProjectManager : public Control {
 	VBoxContainer *ask_update_vb = nullptr;
 	Label *ask_update_label = nullptr;
 	CheckBox *ask_update_backup = nullptr;
+	CheckBox *ask_upgrade_tool = nullptr;
 	Button *full_convert_button = nullptr;
 	Button *migration_guide_button = nullptr;