bug#29343: Match data doesn't contain elements for trailing non-matched subgroups

[Lars Ingebrigtsen]

Philipp Stephani <p.stephani2@gmail.com> writes:

> It turns out that this is harder than I expected, because the
> information about the number of groups in the pattern isn't stored
> anywhere, and search_regs.num_regs may be different from the group
> count. If it turns out too hard to fix, the behavior should at least
> be documented.

I've now mentioned this in the doc string in Emacs 29.

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