title: Detect file change, offer to reload file
body: <p>I normally use gVim for editing, but I sometimes use vim when remotely connecting to my machine.</p>
  
  <p>When I have a file opened in gVim and it has changed from outside (e.g. new updates from repository), gVim offers to reload it.</p>
  
  <p>However when such a thing happens with Vim, it does nothing until you try to save the file. It just warns you that file has changed, but does not offer to reload it.</p>
  
  <p>It there a setting to make Vim's behavior match gVim?</p>