Subject: bug#39350: M-x shell needs help to start expanding

From: 積丹尼 Dan Jacobson <[email-masked]>
Date: Thu, 30 Jan 2020 07:18:28 +0800

$ mkdir /tmp/z
$ cd /tmp/z
$ touch bla
$ emacs -q -f shell
ls <TAB>

Why does it do nothing?
Why do I have to help it out with
ls b<TAB>
before it starts expanding?

emacs-version "26.3"