bug#50766: Regexp paren pairs in query-replace-regexp prompt should be highlighted

[martin rudalics]

>> If it still applies, you have tried it and think it's desirable, I can
>> write ChangeLog and NEWS entries.
>
> It still applies, and it works here.  Please go ahead.

It did not apply to current master.  I now built master for the first
time this year, rewrote the patch so it applies and added a short text
to the Elisp manual.  I also enclose a NEWS and a ChangeLog entry.
Please tell me if something is missing and install however you see fit.

Thanks, martin

minibuffer.el.diff
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NEWS.txt
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ChangeLog
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