KERNEL-11911 fix: "bi.textarea_editor"提供了setWatermark方法,但是却没动态更新title

src/base/single/editor/editor.textarea.js

@@ -79,7 +79,7 @@ BI.TextAreaEditor = BI.inherit(BI.Single, {
             BI.Widget._renderEngine.createElement(document).unbind("mousedown." + self.getName());
         });
         this.content.element.keydown(function () {
-           // 水印快速消失
+            // 水印快速消失
             self._checkWaterMark();
         });
         this.content.element.keyup(function (e) {
@@ -111,7 +111,6 @@ BI.TextAreaEditor = BI.inherit(BI.Single, {
                         cls: "bi-water-mark textarea-watermark",
                         textAlign: "left",
                         whiteSpace: o.scrolly ? "normal" : "nowrap",
-                        title: o.watermark,
                         text: o.watermark,
                         invalid: o.invalid,
                         disabled: o.disabled,