Made live area hidden.

Author: azaslonov

src/ko/ui/defaultViewManager.html

@@ -1,5 +1,5 @@
 <!-- ko if: host -->
-<div aria-live="assertive" data-bind="livearea: {}"></div>
+<div class="text-hide" aria-live="assertive" data-bind="livearea: {}"></div>
 <div id="contentEditor" class="viewport" tabindex="0"
     data-bind="host: { viewport: viewport, host: host, block: block, onDocumentCreated: onHostDocumentCreated, onDocumentDisposed: onHostDocumentDisposed  }"></div>
 <!-- /ko -->