Notify user that file has been modified by external process before trying to edit open file?

[jearlyno10]

A nit of a problem I sometimes encounter is that I edited a file outside of helix and forgot to reload the file before making other changes within helix. Then I hit "file modified by an external process" and either have to overwrite on disk or undo, reload, and reapply my more recent changes.

Is it possible to detect the file has been modified externally before I make my changes, not when I come to writing to disk?

[kirawi]

#14544 (only on Linux ATM)