bug#62892: proposal to extend mark-sexp to go forward and backward on command

[Juri Linkov]

> C-M-@ is bound to `#'mark-sexp`. This command works incrementally -- that
> is, calling this once marks the sexp after point; calling it again marks
> one more sexp (in total, the two sexps after point).
>
> It would be convenient to easily be able to mark sexps backwards as well.

Did you know that it's possible to switch directions by typing 'C-x C-x'.
After that 'C-M-@' extends the region backwards.