> Would it help to have facilities of specifying the files in a project
> by starting with an empty project, and then adding the files one by
> one? Also, to be able to say that all the files in a given directory
> (optionally, only files that match some shell wildcard), recursively,
> should be added to a project?

Yeah! I actually suggested something like that. However, this will not fix the issue with programs looking for a specific directory for root. Such as eglot and whatever-language-server.

> This would probably need a way of making the list of files/directories
> in a project persistent between sessions, because currently we rely on
> the filesystem or a VCS to record that.

Yeah, maybe something like that too.
Theo