My use is similar to Michael's.

That being said, I think giving users the option, assuming they are aware
of the risks,
is a good idea.

I do however think that this should be a separate flag as I dislike
extra options being bolted on to booleans.

On Mon, May 10, 2021 at 2:32 PM Michael J Gruber <git@grubix.eu> wrote:

> David Bremner venit, vidit, dixit 2021-05-10 14:04:27:
> > Felipe Contreras <felipe.contreras@gmail.com> writes:
> >
> > >
> > > It makes sense that by default synchronize_flags=true doesn't sync the
> > > trash flag, but what's wrong with a new configuration
> > > synchronize_flags=all that does?
> > >
> >
> > That seems plausible to me, but I'd like more input in case I missed
> > something.
>
> What happens if you have multiple copies of the same message, some "unseen"
> or "replied" etc.? notmuch synchronizes them with the flag on the
> message and in turn with all message copies, and this works "as
> expected" because, for example, there is no "unseen" flag but a "seen"
> flag.
>
> Well, partially. What happens if you mark a message unread (clear the
> "seen" flag) in one account? Notmuch will see a changed message file for
> one copy - will it reread all files for this mid and reconstruct the
> flags (thereby overwriting the unseen with the seen from the other one)?
> (Honest question, I don't know.)
>
> Deleting by chance is more harmful, yes. But is it more typical to clear
> out duplicate files using "T" or to delete a message (i.e. all it's file
> copies)? I'd even argue for the latter, at least for supporting
> "maildir.synchronize_deleted" in both directions. To be super-safe, one
> could special case this to take an AND of all message delete flags:
> "unread" already acts as if it was an AND of the unread flags of all
> copies (because it's the negation of an OR of seen flags).
>
> A one-sync, however, can be confusing, I'm afraid.
>
> Personally, I use trash folders synced with flags (through mbsync+afew,
> gmailieer) togther with the typical 30day clean-up. Has worked well so
> far.
>
> Cheers
> Michael
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