Bug 1301342 - hide filter icon when editing property in ruleview;r=gl

MozReview-Commit-ID: HYHGBk0J9y7

--HG--
extra : rebase_source : 7e2abfc4742e856fd2087a79b80c54afa8a4bcac

devtools/client/inspector/rules/views/text-property-editor.js

@@ -453,6 +453,7 @@ TextPropertyEditor.prototype = {
 
   _onStartEditing: function () {
     this.element.classList.remove("ruleview-overridden");
+    this.filterProperty.hidden = true;
     this.enable.style.visibility = "hidden";
   },