Custom keyboard shortcuts disappear when setting an extension base directory

[ksnortum]

Frescobaldi: 4.0.6.dev1
Extension API: 0.9.0
Python: 3.13.7
Git branch: master
on commit: c6bece3
python-ly: 0.9.9
Qt: 6.10.0
PyQt: 6.10.2
qpageview: 1.0.3
OS: Linux-6.17.0-14-generic-x86_64-with-glibc2.42 (Ubuntu 25.10)
Installation kind: distro package or installed from source

In testing someone's extension, I noticed that custom keyboard shortcuts disappear when trying to set a base directory for extensions. It doesn't seem to be related to any specific extension; just setting the base will do it. Here are the steps to recreate the problem (at least on my system):

1. Copy the Frescobaldi preferences.conf file or start with a fresh install
2. Create a custom shortcut for a snippet
3. Edit -> Preferences -> Extensions and select a base directory for the extensions
4. Frescobaldi requires a restart. Cancel.
5. Close Frescobaldi manually and relaunch it.
6. The custom shortcuts for snippets are gone.

Note that my system is setup in a way that makes automatic restarts in Frescobaldi not work. I don't know if this is part of the problem or not. (I will try this on another system soon.)

[ksnortum]

After trying this on a Windows 11 system, it seems it is the specific extension that is the problem. See igneus/frescobaldi-file-browser-extension#1