bug#28090: Allow nnir to search in embedded topics

[Lars Ingebrigtsen]

Marcin Włodarczak <marcin@wlodarczak.org> writes:

> Given a topic hierarchy, nnir only searches at the top-most level
> (relative to point position). In other words, in a hierarchy like this
>
> [Topic 1]
>   [Subtopic 1]
>   [Subtopic 2]
>
> if the point is on the line with [Topic 1], nnir searches groups
> directly in that topic but not in [Subtopic 1] or [Subtopic 2]. Tested
> with nnimap groups.

This is now fixed in Emacs 27, but only vaguely tested.

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