Add the ability to filter out installation sources
When using flatpak for both development and regular use, you often end up with two installations of the same repository - one on the system and one for the user. The user installation is only used for GNOME Builder, in my case. But the system installation is where I always want apps to come from.
This issue means that often I will see something like this in the installation source popover:
I'd like the ability to filter out user installations, as I never install applications from there, and Software defaults to the system installation.