Ticket #7347: 7347.patch

_source/plugins/dialog/plugin.js

@@ -1905 +1905 @@
         var covers = {},
                 currentCover;
 
+        function cancelEvent( ev )
+        {
+                ev.data.preventDefault(1);
+        }
+
         function showCover( editor )
         {
                 var win = CKEDITOR.document.getWindow();
@@ -1965 +1970 @@
                         coverElement = CKEDITOR.dom.element.createFromHtml( html.join( '' ) );
                         coverElement.setOpacity( backgroundCoverOpacity != undefined ? backgroundCoverOpacity : 0.5 );
 
+                        coverElement.on( 'keydown', cancelEvent );
+                        coverElement.on( 'keypress', cancelEvent );
+                        coverElement.on( 'keyup', cancelEvent );
+
                         coverElement.appendTo( CKEDITOR.document.getBody() );
                         covers[ coverKey ] = coverElement;
                 }