Ticket #5778: 5778.patch

_source/plugins/selection/plugin.js

@@ -172 +172 @@
                                                         });
                                                 }
 
+                                                var scroll;
                                                 // IE fires the "selectionchange" event when clicking
                                                 // inside a selection. We don't want to capture that.
-                                                body.on( 'mousedown', disableSave );
+                                                body.on( 'mousedown', function( evt )
+                                                {
+                                                        // IE scrolls document to top on right mousedown
+                                                        // when editor has no focus, remember this scroll
+                                                        // position and revert it before context menu opens. (#5778)
+                                                        if ( evt.data.$.button == 2 )
+                                                        {
+                                                                var sel = editor.document.$.selection;
+                                                                if ( sel.type == 'None' )
+                                                                        scroll = editor.window.getScrollPosition();
+                                                        }
+
+                                                        disableSave();
+                                                });
                                                 body.on( 'mouseup',
-                                                        function()
+                                                        function( evt )
                                                         {
+                                                                // Restore recorded scroll position when needed on right mouseup.
+                                                                if ( evt.data.$.button == 2 && scroll )
+                                                                {
+                                                                        editor.document.$.documentElement.scrollLeft = scroll.x;
+                                                                        editor.document.$.documentElement.scrollTop = scroll.y;
+                                                                }
+
+                                                                scroll = null;
                                                                 saveEnabled = true;
                                                                 setTimeout( function()
                                                                         {