Fix validation of Revert menu item.
Fix validation of Revert menu item.
ycaihua/skim-app,ycaihua/skim-app,WoLpH/skim,ycaihua/skim-app,ycaihua/skim-app,ycaihua/skim-app,WoLpH/skim,WoLpH/skim,WoLpH/skim,WoLpH/skim