bug#50387: Possible bug in Tramp or in completions

[Gregory Heytings]

> > > That means, "scp:" hasn't been passed to 
> > > tramp-completion-handle-file-name-all-completions, and the result of 
> > > that function looks proper to me.
> >
> > Yet it isn't.
>
> Why not? In this example, `completion-styles' contains `substring'. And 
> then you ask for completion of "/scp:". Looking at the candidates 
> returned by `tramp-completion-handle-file-name-all-completions', only 
> "pscp:" and "scp:" have the substring "scp:".

Because after typing "/s" or "/sc" or "/scp" it makes sense to see that 
"/scp:" is among the completion candidates, but after typing "/scp:" it 
doesn't make sense anymore, the method has already been entered by the 
user, what they now want to see is a list of hosts, and there is no way to 
see it.

> > - before your attempt to fix the problem, C-x C-f / TAB only displayed 
> > "scp:" and "scpx:" among the completion candidates (or e.g. "ssh:", 
> > "sshfs:" and "sshx:" with tramp-default-method set to "ssh");
>
> Yes, this is changed.
>
> > - now C-x C-f / TAB displays all Tramp methods;
>
> When Tramp is loaded. I regard this to be correct.
>
> > - with my patch, which actually fixes the bug, C-x C-f / TAB does not 
> > display any Tramp method, as it should.
>
> Again, C-x C-f / TAB displays a Tramp method only when Tramp is loaded.

I filed a bug report, explained in every detail what the bug is, provided 
a patch, and the end result is a situation that is worse than earlier.  I 
expect other bug reports from confused users, and hope that you'll change 
your mind.

Closing.