Sometimes when closing vscode, or a tab therein, I get a dialogue asking "Do you want to save the changes you made to filename?" 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 undo to revisit the last edits doesn't work either.
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 "show diff" option in the dialogue, but for now I'm also happy with a command line diff command.
I'm using ubuntu 20.04.