> My problem is how to do this in a way that only affects "M-x
> completion-at-point", but doesn't affect completion of tags in M-. or
> other scenarios.  Can you suggest how to use the above so as to not
> affret anything except completion-at-point?

To the extend that `M-.` could decide to use `completion-at-point`, I'm
not sure this is possible in general, but maybe a patch like the one below
can work well enough in practice?


        Stefan