On Thu, Feb 09, 2023 at 10:03:37PM +0100, Christian Weisgerber wrote:
> Stefan Sperling:
> 
> > > Oh, the log message must be actually modified?  Can't you just
> > > compare mtime before/after,
> > 
> > There would be no way to reverse your decision to commit once the
> > timestamp has been changed. But I guess that is fine.
> 
> The commit is aborted if
> * the time stamp of the log message hasn't changed, or
> * the log message is empty.
> 
> Is that practical?

Yes, I believe so.
In particular because this behaviour is easy to explain and understand.
And, of course, "empty" means: empty with comments removed