Scaling of image produced for math in Info in the Emacs Info reader

[Patrice Dumas]

Hello,

In the development version of GNU Texinfo, we have added a new
functionality, a conversion of math commands to images.  This was a
request from Rahguzar for the Emacs Info reader:
https://lists.gnu.org/archive/html/help-texinfo/2024-08/msg00001.html

It was implemented recently in texi2any/makeinfo:
https://lists.gnu.org/archive/html/bug-texinfo/2024-12/msg00061.html

However, the images are not scaled correctly, they should be scaled
according to the user font size in Emacs.  We discussed about this
issue, and came to the conclusion that with the image generated from
math commands in Info file there should be some information on the image
size and that the Emacs Info viewer should be modified to take advantage
of this information to rescale the images.  We discussed about the
information that could be added to Info in those mails:
https://lists.gnu.org/archive/html/bug-texinfo/2025-01/msg00005.html
https://lists.gnu.org/archive/html/bug-texinfo/2025-01/msg00048.html

Eli Zaretskii suggested that we start a discussion on emacs-devel on
those subjects, so here it is.  Any feedback on the overall issue, on
what we should provide in Info, anybody interested in doing the change
in the Emacs Info reader?

PS: please keep me in CC, I am not subscribed.

-- 
Pat