Make undo/redo shortcuts work from sidebar docking window

Change-Id: I20ec2363d156d51528d4cce618311b8b919dfb87
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89314
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

sfx2/source/sidebar/SidebarDockingWindow.cxx

@@ -21,6 +21,7 @@
 #include <sfx2/sidebar/SidebarController.hxx>
 #include <sidebar/PanelDescriptor.hxx>
 
+#include <comphelper/dispatchcommand.hxx>
 #include <comphelper/processfactory.hxx>
 #include <sfx2/lokhelper.hxx>
 #include <sfx2/bindings.hxx>
@@ -276,6 +277,11 @@ bool SidebarDockingWindow::EventNotify(NotifyEvent& rEvent)
                 Close();
             return true;
         }
+        if (".uno:Undo" == aCommand || ".uno:Redo" == aCommand)
+        {
+            comphelper::dispatchCommand(aCommand, {});
+            return true;
+        }
     }
     else if (MouseNotifyEvent::MOUSEBUTTONDOWN == nType)
     {