Ticket #8299: 8299_2.patch

_source/plugins/wysiwygarea/plugin.js

@@ -1110 +1110 @@
                                                         if ( sel && !sel.isLocked )
                                                         {
                                                                 var isDirty = editor.checkDirty();
+                                                                editor.fire( 'saveSnapshot', { contentOnly : 1 } );
                                                                 onSelectionChangeFixBody.call( this, evt );
                                                                 editor.fire( 'updateSnapshot' );
                                                                 !isDirty && editor.resetDirty();

_source/plugins/undo/plugin.js

@@ -64 +64 @@
                         editor.on( 'afterCommandExec', recordCommand );
 
                         // Save snapshots before doing custom changes.
-                        editor.on( 'saveSnapshot', function()
+                        editor.on( 'saveSnapshot', function( evt )
                                 {
-                                        undoManager.save();
+                                        undoManager.save( evt.data && evt.data.contentOnly );
                                 });
 
                         // Registering keydown on every document recreation.(#3844)