不能清除非当前题的轨迹

src/components/mark/MarkBoardTrack.vue

@@ -163,6 +163,7 @@ export default defineComponent({
           q.mainNumber === store.currentQuestion?.mainNumber &&
           q.subNumber === store.currentQuestion?.subNumber
       );
+      if (ts.length === 0) return;
       const maxNumber = Math.max(...ts.map((q) => q.number));
       const idx = store.currentMarkResult.trackList.findIndex(
         (q) =>