Navigating completions from minibuffer

[T.V Raman]

This change:
f0c0ff6bf23 * New option to use arrows in the minibuffer to select completions 
(bug#59486)
works really well but appears to  introduce a separate problem:

Assume you have a command  e.g. foo but also foo-bar and foo-bas.

Earlier you could type M-x foo and press enter to invoke foo.

Now, with the new option enabled, typing
M-x foo
appears to require that you first press TAB before pressing RET.

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