Hi Mattias,

I haven't looked at your patch, but I hope you are taking care with

the C-M- family of commands. It is not only mark-sexp that has

that property that it warns about something potentially off screen.

Many other C-M- commands also have that. Think M-7 C-M-k for

example. I hope you understand you are touching a cornerstone

of Lisp-related (actually, not only Lisp) editing here.

So I think I can get used to differently worded messages, but the

errors themselves are pretty useful.

João

On Mon, Sep 21, 2020 at 6:12 PM Mattias Engdegård <mattiase@acm.org> wrote:

21 sep. 2020 kl. 10.49 skrev João Távora <joaotavora@gmail.com>:

> If, however,
> the message is "Unbalanced parenthesis", I know something's up
> and have to fix it.

Thanks for mentioning mark-sexp; it was accidentally omitted in my patch. I agree that this particular condition in mark-sexp merits special treatment; the reason for not being able to extend the mark may be far from the cursor and even off-screen.
It is probably worthwhile to communicate the "unbalanced parenthesis" case differently.

For those wondering what this is about: the condition arises when C-M-SPC is pressed with point before an unbalanced left bracket.

João Távora