Another fix for when a new main window menu item is inserted between the windows of another document. 
Another fix for when a new main window menu item is inserted between the windows of another document. 
WoLpH/skim,WoLpH/skim,WoLpH/skim,WoLpH/skim,ycaihua/skim-app,WoLpH/skim,ycaihua/skim-app,ycaihua/skim-app,ycaihua/skim-app,ycaihua/skim-app