bug#58158: 29.0.50; [overlay] Interval tree iteration considered harmful

[Gerd Möllmann]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> I changed the code to store the `visited` bit in the work stack, but if
> you could rewrite the `interval_generator_next` along the lines of the
> code above that would be great.

Ok, I'll rewrite that :-).  When I understand what that "narrowing" is
and how and for what it is used.

BTW, what do you think of changing function names to something a bit
shorter?  I find myself constantly getting confused when reading the
code.  I think an "itree_" prefix would suffice for non-static
functions, and static ones without prefix.  Renaming that is hopefully
not that much work with LSP.

> [ An alternative would be to try and get rid of the `parent` field :-)
> ]

:-)