bug#41890: 28.0.50; [PATCH]: Add bindings for project.el

[Juri Linkov]

> As I said, I haven't tried anything out, and maybe the issue doesn't
> exist or is circumventable (eg. by having every function reset the
> global value after using it), but is that really worth it just to use a
> transient map? Or did I miss something?

A new variable could introduce a new notion of "the current project".
This implies that some commands used in other buffers will be applied
to the currently active project.

This is similar to the notion of next-error-last-buffer -
the most recent buffer for next-error commands.

I don't know if a real need exists for such thing,
so please leave project-switch-project without a
transient map if it already works well.