title: See unsaved changes in vscode
body: <p>Sometimes when closing vscode, or a tab therein, I get a dialogue asking &quot;Do you want to save the changes you made to <code>filename</code>?&quot; However, the unsaved edits are actually from a previous session that was closed without such a query, probably when turning off the computer, so I can't remember if it was meaningful edits, or maybe just an accidental key-press, like a shortcut gone wrong; and doing <code>undo</code> to revisit the last edits doesn't work either.</p>
  <p>My question: How can I see the diff between the saved version of a file, and the version in the editor window? I think it would be nicest just to have a &quot;show diff&quot; option in the dialogue, but for now I'm also happy with a command line diff command.</p>
  <p>I'm using ubuntu 20.04.</p>