bug#16135: After backward-up-list in jit-lock-after-change-extend-region-functions, insert-parentheses malfunctions

[Glenn Morris]

Barry OReilly wrote:

>   (add-hook 'jit-lock-after-change-extend-region-functions
>             (lambda (_start _end _old-len)
>               (condition-case nil
>                   (backward-up-list)
>                 (scan-error nil)))
>             nil
>             t)
[...]
> Insert parentheses:
>
>   M-(
>
> Inserted into *scratch* buffer:
>
>   ) (
>
> But expected:
>
>   ()

Well, it sounds like you shouldn't do that, then.