Fellow Linux user here (though not Fedora). It sounds like you’re having similar problems as I did under Linux Mint a few months ago. The “can’t save” problem was solved for me when I installed the outdated version of
libgoocanvas3, which may or may not have the same package name under Fedora.
The basic issue is that the GNOME version of Inform is built to work with the GTK libraries, and the GTK team wants to push everyone to move from GTK version 2 to GTK version 3. At least some distros are no longer distributing (at least some of) GTK 2 through their standard software repositories at all, so installing an older version of the component that Inform depends on may not be easy for you. Under Linux Mint, I was able to find a
.deb package that provides an older version of the necessary component, which may be the thing that would help you.
On the other hand, maybe Fedora is still distributing an older version of the necessary component, either instead of or alongside the newer version! I don’t know, since I haven’t used Fedora in a long time. But downloading the Fedora package and trying to get
yum to install it should also try to install anything it depends on – have you tried using
yum in a terminal to see whether it tries to pull in more dependencies, and what it complains about if it can’t install them?
Apologies if I’m going over ground that you’ve already covered – I’m just trying to make sure the basics have been exhausted already. I hope that’s helpful!