bug#59122: 29.0.50; global-text-scale-adjust not working

[Robert Pluim]

>>>>> On Wed, 09 Nov 2022 16:59:04 +0200, Eli Zaretskii <eliz@gnu.org> said:

    >> Cc: 59122@debbugs.gnu.org, salutis@me.com, stefankangas@gmail.com
    >> Date: Wed, 09 Nov 2022 16:51:26 +0200
    >> From: Eli Zaretskii <eliz@gnu.org>
    >> 
    >> > Thanks.  The safe fix should be to change 5 to 6 here.  Eli, do you 
agree, 
    >> > or is there something else to investigate?
    >> 
    >> Can you tell more?  I don't think I understand why decreasing the face
    >> height by 5 doesn't work, but decreasing it by 6 does.  If you do
    >> understand, please tell.

    Eli> Also, how come text-scale-adjust does work on the same platform?

As far as I can tell from its somewhat convoluted code and docstrings,
that scales up and down by 20% every time.

Robert
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