bug#51312: 29.0.50; Indenting vectors with leading spaces errors out

[martin rudalics]

> Trying to use the newish space-after-parenthesis syntax errors out when
> you hit tab on the second line:
>
> [ :foo :zot
>        :bar]
>
> forward-sexp: Scan error: "Containing expression ends prematurely", 1, 1

Can you try the attached patch?

Thanks, martin

lisp-mode.el.diff
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