[Bug python/30044] Flawed logic when releasing values from all_values buffer

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30044

--- Comment #6 from Tom Tromey <tromey at sourceware dot org> ---
I apparently knew about this problem in the relatively recent past:

commit 42331a1ea2a13ce15ec202c5f0fbef3e5171253c
Author: Tom Tromey <tom@tromey.com>
Date:   Fri Mar 13 17:39:52 2020 -0600

    Change extension language pretty-printers to use value API

    This changes the extension language pretty-printers to use the value
    API.

    Note that new functions were needed, for both Guile and Python.
    Currently both languages always wrap values by removing the values
    from the value chain.  This makes sense to avoid strange behavior with
    watchpoints, and to avoid excessive memory use.  However, when
    printing, it's important to leave the passed-in value untouched, in
    case pretty-printing does nothing -- that way the caller can still
    access it.


This was part of the val_print removal series.

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