bug#43128: Acknowledgement (27.1; DPI change not detected after switching to Emacs 27.1)

[Vincent Bernat]

 ❦ 19 July 2021 15:03 +03, Eli Zaretskii:

>> >> > As I mentioned in https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36284#8,
>> >> > a proper fix would be to implement replacements for
>> >> > XftDefaultSubstitute and XftDefaultSet.
>> >> 
>> >> How complicate will such a change be?  Will it be simple and safe
>> >> enough to allow installing such a change on the emacs-27 branch?
>> >
>> > Ping!  Could we please try solving this for Emacs 27.2?  Mitsuharu,
>> > could you please show the fix you had in mind back then?
>> 
>> Hey! Is there any news around this? The XFT backend seems to have some
>> issues with TTC fonts that the Cairo backend does not.
>
> Sadly, no news yet.  Patches or ideas how to fix this are welcome.

I'll try to do something, but I have no experience with either Xft or
Cairo, so if that's something clever to do, I am likely to fail.
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