My question is to the core dev’s here.
There are several bugs reports arround related to problems loading and scaling ICO files with multiple sizes.
Myself I touched that problem while trying to load such a file with PyGObject (Debian stable). Details and an mwe can be found here: https://mail.gnome.org/archives/python-hackers-list/2019-June/msg00000.html
The list of bug reportes I found myself is documented here: https://mail.gnome.org/archives/python-hackers-list/2019-June/msg00003.html
Does all this reports rooting to the same problem?
The bug reports are quite old and it is unclear for me if the problems are still fixed in the dev/upstream version of Gtk/PyGObject. I have currently no idea how to install a upstream version of PyGObject to test arround if my problem can be reproduced their, too. It would be great if some of you could try out my mwe code (see first link).
The other question is how can I go on? I think it do not help if I also open a BugReport for PyGObject. What would you (as core devs) recommand?