Don't clear CodeMirror inline styles on setText (#384)

Author: krafftsimon

lib/firepad.js

@@ -215,10 +215,10 @@ firepad.Firepad = (function(global) {
       return this.ace_.getSession().getDocument().setValue(textPieces);
     } else {
       // HACK: Hide CodeMirror during setText to prevent lots of extra renders.
-      this.codeMirror_.getWrapperElement().setAttribute('style', 'display: none');
+      this.codeMirror_.getWrapperElement().style.display = "none";
       this.codeMirror_.setValue("");
       this.insertText(0, textPieces);
-      this.codeMirror_.getWrapperElement().setAttribute('style', '');
+      this.codeMirror_.getWrapperElement().style.display = "";
       this.codeMirror_.refresh();
     }
     this.editorAdapter_.setCursor({position: 0, selectionEnd: 0});