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

[Vincent Bernat]

 ❦  2 septembre 2020 09:28 +02, Vincent Bernat:

> From configure.ac, I see that I go into the Cairo branch which disables
> Xft:
>
> #+begin_src sh
>   if test $HAVE_CAIRO = yes; then
>     dnl Strict linkers fail with
>     dnl ftfont.o: undefined reference to symbol 'FT_New_Face'
>     dnl if -lfreetype is not specified.
>     dnl The following is needed to set FREETYPE_LIBS.
>     EMACS_CHECK_MODULES([FREETYPE], [freetype2])
>
>     test "$HAVE_FREETYPE" = "no" && AC_MSG_ERROR(cairo requires libfreetype)
>
>     EMACS_CHECK_MODULES([FONTCONFIG], [fontconfig >= 2.2.0])
>
>     test "$HAVE_FONTCONFIG" = "no" && AC_MSG_ERROR(cairo requires 
> libfontconfig)
>     dnl For the "Does Emacs use" message at the end.
>     HAVE_XFT=no
> #+end_src
>
> So, no XFT seems to mean, no DPI change is possible. Is that expected?

Disabling Cairo fixes the problem for me.
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