bug#22983: syntax-ppss returns wrong result.

[Alan Mackenzie]

Hello, Stefan.

On Sun, Mar 13, 2016 at 01:37:27PM -0400, Stefan Monnier wrote:
> >> But it's not the semantics these .el files get.  What's probably keeping
> >> them functional is the rarity with which buffers are narrowed to an
> >> "awkward" point-min.
> > Another thing that keeps it together, is that narrowing, as a user-level
> > operator, is not that popular.

> Luckily, yes.

I happen to use it frequently.  I expect other users do, to.  It's
useful.

> > Personally, I consider it an anti-feature.

> Same here.  Luckily also, as pointed out elsewhere, the semantics of it
> is unclear, so that in several important cases, whichever behavior we
> end up choosing will be both correct for some users and incorrect
> for others.

That's pure sophistry.  The semantics needed are quite clear:  What were
strings and comments before narrowing should remain strings and comments
after narrowing.  Otherwise, nothing would work in such a narrowed
buffer.  font-locking, for example, behaves properly in a narrowed
buffer.

> Hence, so far, I didn't make any effort to try and "do the right thing"
> for user-activated narrowing, since these are just not well defined
> enough to even determine what is "the right thing".

Lets define them as I said in the previous paragraph.  Or can you
conceive of a use case where one would want narrowing to invert strings
and non-strings, leaving comments totally random?

Do you have any views on how the bug should be resolved?

>         Stefan

-- 
Alan Mackenzie (Nuremberg, Germany).