Enhance(frontend): Shift+Tabで前の補完候補が選択できるように (#12704)

* Shift+Tabで前の補完候補が選択できるように

* update CHANGELOG.md

packages/frontend/src/components/MkAutocomplete.vue

@@ -359,12 +359,25 @@ function onKeydown(event: KeyboardEvent) {
 			}
 			break;
 
-		case 'Tab':
 		case 'ArrowDown':
 			cancel();
 			selectNext();
 			break;
 
+		case 'Tab':
+			if (event.shiftKey) {
+				if (select.value !== -1) {
+					cancel();
+					selectPrev();
+				} else {
+					props.close();
+				}
+			} else {
+				cancel();
+				selectNext();
+			}
+			break;
+
 		default:
 			event.stopPropagation();
 			props.textarea.focus();