Replace some bits of code left to work with the new `TabContainer`

editor/editor_resource_picker.cpp

@@ -337,7 +337,7 @@ void EditorResourcePicker::_edit_menu_cbk(int p_which) {
 
 			// Ensure that the FileSystem dock is visible.
 			TabContainer *tab_container = (TabContainer *)file_system_dock->get_parent_control();
-			tab_container->set_current_tab(file_system_dock->get_index());
+			tab_container->set_current_tab(tab_container->get_tab_idx_from_control(file_system_dock));
 		} break;
 
 		default: {

editor/plugins/script_editor_plugin.cpp

@@ -810,7 +810,7 @@ void ScriptEditor::_close_tab(int p_idx, bool p_save, bool p_history_back) {
 	}
 	if (idx >= 0) {
 		if (history_pos >= 0) {
-			idx = history[history_pos].control->get_index();
+			idx = tab_container->get_tab_idx_from_control(history[history_pos].control);
 		}
 		tab_container->set_current_tab(idx);
 	} else {
@@ -1429,7 +1429,7 @@ void ScriptEditor::_menu_option(int p_option) {
 					file_system_dock->navigate_to_path(path);
 					// Ensure that the FileSystem dock is visible.
 					TabContainer *tab_container = (TabContainer *)file_system_dock->get_parent_control();
-					tab_container->set_current_tab(file_system_dock->get_index());
+					tab_container->set_current_tab(tab_container->get_tab_idx_from_control(file_system_dock));
 				}
 			} break;
 			case CLOSE_DOCS: {
@@ -3376,7 +3376,7 @@ void ScriptEditor::_update_history_pos(int p_new_pos) {
 	}
 
 	history_pos = p_new_pos;
-	tab_container->set_current_tab(history[history_pos].control->get_index());
+	tab_container->set_current_tab(tab_container->get_tab_idx_from_control(history[history_pos].control));
 
 	n = history[history_pos].control;
 

editor/project_settings_editor.cpp

@@ -63,7 +63,7 @@ void ProjectSettingsEditor::queue_save() {
 }
 
 void ProjectSettingsEditor::set_plugins_page() {
-	tab_container->set_current_tab(plugin_settings->get_index());
+	tab_container->set_current_tab(tab_container->get_tab_idx_from_control(plugin_settings));
 }
 
 void ProjectSettingsEditor::update_plugins() {

editor/property_editor.cpp

@@ -228,7 +228,7 @@ void CustomPropertyEditor::_menu_option(int p_which) {
 					file_system_dock->navigate_to_path(r->get_path());
 					// Ensure that the FileSystem dock is visible.
 					TabContainer *tab_container = (TabContainer *)file_system_dock->get_parent_control();
-					tab_container->set_current_tab(file_system_dock->get_index());
+					tab_container->set_current_tab(tab_container->get_tab_idx_from_control(file_system_dock));
 				} break;
 				default: {
 					if (p_which >= CONVERT_BASE_ID) {

editor/scene_tree_editor.cpp

@@ -135,7 +135,8 @@ void SceneTreeEditor::_cell_button_pressed(Object *p_item, int p_column, int p_i
 
 		set_selected(n);
 
-		NodeDock::get_singleton()->get_parent()->call("set_current_tab", NodeDock::get_singleton()->get_index());
+		TabContainer *tab_container = Object::cast_to<TabContainer>(NodeDock::get_singleton()->get_parent());
+		NodeDock::get_singleton()->get_parent()->call("set_current_tab", tab_container->get_tab_idx_from_control(NodeDock::get_singleton()));
 		NodeDock::get_singleton()->show_connections();
 
 	} else if (p_id == BUTTON_GROUPS) {
@@ -144,7 +145,8 @@ void SceneTreeEditor::_cell_button_pressed(Object *p_item, int p_column, int p_i
 
 		set_selected(n);
 
-		NodeDock::get_singleton()->get_parent()->call("set_current_tab", NodeDock::get_singleton()->get_index());
+		TabContainer *tab_container = Object::cast_to<TabContainer>(NodeDock::get_singleton()->get_parent());
+		NodeDock::get_singleton()->get_parent()->call("set_current_tab", tab_container->get_tab_idx_from_control(NodeDock::get_singleton()));
 		NodeDock::get_singleton()->show_groups();
 	}
 }