Ticket #6473: 6473.patch

_source/plugins/wysiwygarea/plugin.js

@@ -1000 +1000 @@
                         // Switch on design mode for a short while and close it after then.
                         function blinkCursor( retry )
                         {
-                                CKEDITOR.tools.tryThese(
-                                        function()
-                                        {
-                                                editor.document.$.designMode = 'on';
-                                                setTimeout( function()
-                                                {
-                                                        editor.document.$.designMode = 'off';
-                                                        if ( CKEDITOR.currentInstance == editor )
-                                                                editor.document.getBody().focus();
-                                                }, 50 );
-                                        },
-                                        function()
-                                        {
-                                                // The above call is known to fail when parent DOM
-                                                // tree layout changes may break design mode. (#5782)
-                                                // Refresh the 'contentEditable' is a cue to this.
-                                                editor.document.$.designMode = 'off';
-                                                var body = editor.document.getBody();
-                                                body.setAttribute( 'contentEditable', false );
-                                                body.setAttribute( 'contentEditable', true );
-                                                // Try it again once..
-                                                !retry && blinkCursor( 1 );
-                                        });
+                                // Avoid toggling design mode in an event thread,
+                                // which will cause host page scrolling.(#6473)
+                                setTimeout( function ()
+                                 {
+                                         CKEDITOR.tools.tryThese(
+                                                 function()
+                                                 {
+                                                         editor.document.$.designMode = 'on';
+                                                         setTimeout( function()
+                                                         {
+                                                                 editor.document.$.designMode = 'off';
+                                                                 if ( CKEDITOR.currentInstance == editor )
+                                                                         editor.document.getBody().focus();
+                                                         }, 50 );
+                                                 },
+                                                 function()
+                                                 {
+                                                         // The above call is known to fail when parent DOM
+                                                         // tree layout changes may break design mode. (#5782)
+                                                         // Refresh the 'contentEditable' is a cue to this.
+                                                         editor.document.$.designMode = 'off';
+                                                         var body = editor.document.getBody();
+                                                         body.setAttribute( 'contentEditable', false );
+                                                         body.setAttribute( 'contentEditable', true );
+                                                         // Try it again once..
+                                                         !retry && blinkCursor( 1 );
+                                                 });
+                                 }, 0 );
                         }
 
                         // Create an invisible element to grab focus.