REPORT-72441 fix: 修复初始watermark为空的情况下,后续setWatermark显示重叠问题

src/base/single/editor/editor.js

@@ -261,6 +261,7 @@ BI.Editor = BI.inherit(BI.Single, {
             });
         }
         this.watermark.setText(v);
+        this._checkWaterMark();
     },
 
     _setErrorVisible: function (b) {