Font collections: Cannot use arrow keys to switch fonts in text tool, only toggles between two fonts + crash when deselecting collection
#### Summary:
Video:
#### Steps to reproduce:
- see video
- only tested with a single collection, Inkscape crashed when I unchecked the collection in the text tool to try the same thing with a different collection... (not recorded) - too late for more tests, but wanted this recorded.
#### What happened?
- Text tool toggles between two fonts instead of the whole list
- Inkscape crashes on unchecking font collection in text tool
#### What should have happened?
- should be able to navigate through all fonts in selected collection(s)
- should not crash
#### Version info
```
Inkscape 1.3-dev (f225e03d35, 2023-03-03)
GLib version: 2.72.4
GTK version: 3.24.33
glibmm version: 2.66.2
gtkmm version: 3.24.5
libxml2 version: 2.9.13
libxslt version: 1.1.34
Cairo version: 1.16.0
Pango version: 1.50.6
HarfBuzz version: 2.7.4
OS version: Linux Mint 21.1
```
issue