bug#51650: Autocomplete: first Tab should show *Completions* buffer

[Lars Ingebrigtsen]

Would it be possible to add a user option to make the first tab also
show the *Completions* buffer?

I agree with Eli that Emacs is working as designed here, but I think
some users would find it more logical if the first tab was more
aggressive.

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   bloggy blog: http://lars.ingebrigtsen.no