Re: called by a process filter?

[Richard Stallman]

    > If something looks at this-command inside a process filter, it is
    > probably broken already.  In general it is unpredictable what command
    > is running, or was just running, when the process filter is called.
    > So such code would currently get unpredictable results.

    True.  

    We should set this-command to nil while we a reading a key sequence at
    the top level (and thus may run anync code).

That would be a clean approach.

As for this-process, it would be clean and safe, but at present there
is no clear need to add it.