> 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.
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