bug#59067: 29.0.50; Exexpected overlay order in `overlays-in' return value

[Dmitry Gutov]

On 10.11.2022 16:03, Stefan Monnier via Bug reports for GNU Emacs, the 
Swiss army knife of text editors wrote:
> Maybe Someone™ should browse through the various calls to `overlays-in`
> out there to try and see which orderings could be useful.

FWIW, mmm-mode uses overlay sorting based on the value of overlay-start 
(first come overlays where this value is higher, so basically the more 
deeply nested ones, if we imagine all overlays to be strictly nested, as 
is the case with mmm-mode).

It uses a custom sorting function, though (which also takes priority 
into account), so it shouldn't be affected by the breakage.

You can check it out here, it also seems reasonable as the potential 
default sort: 
https://git.savannah.gnu.org/cgit/emacs/elpa.git/tree/mmm-region.el?h=externals/mmm-mode#n148

If it's not too expensive to use as default, that is.