bug#25529: diagnosis and one approach to a fix

[Dmitry Gutov]

On 07.02.2017 15:07, Tom Tromey wrote:

> Dmitry> I'm not sure. Normally, that helps deal with multiline literals, but
> Dmitry> regexps in JavaScript are single-line. Maybe Stefan remembers.
>
> Based on discussion in the multi-mode thread, I'm thinking perhaps it
> handles the case where the start of the regexp literal was syntax-ified
> but not the end.

That's the idea, but syntax-propertize runs 
syntax-propertize-extend-region-functions, which extends to the 
beginning of the line of the edited region.

So if we made an edit inside a line containing a regexp, START should be 
at the beginning of that line.

There could be some edge cases, though.