bug#9461: 24.0.50; Weird behaviour in "show-parent-mode"

[Stefan Monnier]

> I verified that the following patch provides this result:

Would it be possible to use another patch which shares code between
blink-paren and show-paren?

>             ;; Move back the other way and verify we get back to the
>             ;; starting point.  If not, these two parens don't really match.
>             ;; Maybe the one at point is escaped and doesn't really count.
> It seems irrelevant to the current problem.

It's trying to detect another case, yes.  It would make sense for
show-paren to use the same sanity check, tho.


        Stefan