bug#58479: 29.0.50; [feature/noverlay] Displaced overlays in notmuch search buffers after refreshing

[Stefan Monnier]

> However, I noticed a different problem introduced by the patch.

Are you sure?  The patch should now affect `overlays-at` at all
(actually, one of the reasons for the introduction of the bug fixed by
the patch is because that code path for `get-char-property` does not
rely on the same code path as `overlays-at`.  The old code shared the
code path for those two, but the new code tries to be more efficient by
avoiding allocation for a temporary storage and reducing an O(N log N)
to O(N)))).

> After executing 3, if I run M-x describe-text-properties, the overlay is
> not listed in the text properties. Running
> M-: (overlays-in (point-min) (point-max)) does list the 0-length
> overlay 5..5. However, running M-: (overlays-at 5) yields nil.
>
> I think that the above is not right.

Whether this is "right" or not is a good question, but AFAIK it's the
"expected" behavior in the sense that it's how `overlays-at` has worked
until now.  So I think it's "right".


        Stefan