bug4982 混合表格，插入指标库指标后，指标来源未显示

src/views/datasheet_manage/components/MixedTable.vue

@@ -1309,7 +1309,7 @@ export default {
       if(!source) return
       let concatSourceArr = this.sourceFrom.text?`${this.sourceFrom.text},${source}`.split(','):[source];
       let sourceStr = Array.from(new Set(concatSourceArr)).join(',');
-      this.sourceFrom.text=sourceStr
+      this.$set(this.sourceFrom,'text',sourceStr)
       this.$emit('updateSourceName')
     }
   },