How do I enable speedbar to display all types of files?

Question

I have emacs v23.1.1 on ubuntu 9.10. i can\'t seem to make speedbar to display all files, it only displays directories. Does anyone have an idea with this?

Answer 1

For the sake of keep info updated, in my updated emacs: GNU Emacs 26.1 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.23.2) of 2018-08-13

To get .files continuing be showed, now I have to set

all-types-of-files (custom-set-variables '(speedbar-show-unknown-files t) )

AND

(setq speedbar-directory-unshown-regexp "^\(\.\.*$\)\'")

learned from: https://emacs-devel.gnu.narkive.com/0k8PccN3/speedbar-and-dot-files