On 07.09.2021 19:23, Eli Zaretskii wrote:
>>> No, it's about the features listed after the shown hunk.  I just made
>>> its language less extreme, because xref-find-apropos does exist.
>> tags-apropos-additional-actions, then? That seems easier to support.
> Yes, pretty much.

Here's a quick implementation.

But the feature doesn't seem to be particularly popular/polished: the 
example value for Elisp, for instance, sets up search across all symbols 
(obarray), but subsequent navigation only works for commands, and only 
ones documented in the manual.