bug#23179: 25.0.92; Restore `M-,' to continue etags search

[Anders Lindgren]

> Anders, is that so?  If so, can you tell with which commands you'd
> like to see the UI and with which not to see it, and why?

Ping!  Anders, I'd appreciate an answer to that question, so that I
could figure out what to do with the patch I proposed.  TIA.

Oh, I missed that question.

I would like to have one set of commands to do incremental search and query-replace without a xref UI and one set that do a full search and opens the UI.

The incremental versions could work more or less like tags-search and tags-query-replace do today, but they should work with all(ish) xref backends.

Think of this like C-s vs. M-x occur in a plain buffer.

    -- Anders