Clear text in label selector after typing, fix #942

frontend/components/organisms/annotation/MultiClassClassification.vue

@@ -7,6 +7,8 @@
     hide-selected
     chips
     multiple
+    :search-input.sync="search"
+    @change="search=''"
   >
     <template v-slot:selection="{ attrs, item, select, selected }">
       <v-chip
@@ -51,6 +53,12 @@ export default {
     }
   },
 
+  data() {
+    return {
+      search: ''
+    }
+  },
+
   computed: {
     annotatedLabels: {
       get() {