Arguments are not autocompleted when using the FQCN as id and no class

[stof]

When the class is set automatically from the id, the autocompletion of service arguments (and the hint about their type) is not working.

[stof]

Note that I'm using XML files. I haven't tried to check whether YAML files already support this.

[arjenm]

This doesn't work with YAML in our set-up as well.