the completions process should be aware when users want to give more tips

[Dan Jacobson]

I'd like to complain about a little delay that bothers me and might be
able to be fixed: say we are waiting for the *Completions* to be made,
and we instead decide to help the process along by giving it a few
more letters first and then asking for completions.  The problem only
is present when there are a large number of completions.  Bash gets
around it by asking "Display all 6258 possibilities? (y or n)" but
emacs keeps grinding along, unaware that I want to help it out.

C-x d / d e v / tab t t y tab

Emacs doesn't necessarily have to take the bash route [but
configurable limits sound ok.]  All I think needs to be done is: if
emacs is still doing completion work when the first t of tty is
entered, then treat it as the same as if I typed C-g t, i.e. give
control back to the user, to let him fill in some more of the path
name, and do another tab further along.
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