Variable: speedbar-show-unknown-files
speedbar-show-unknown-files is a customizable variable defined in
speedbar.el.gz.
Value
nil
Documentation
Non-nil show files we can't expand with a ? in the expand button.
A nil value means don't show the file in the list.
Source Code
;; Defined in /usr/src/emacs/lisp/speedbar.el.gz
(defcustom speedbar-show-unknown-files nil
"Non-nil show files we can't expand with a ? in the expand button.
A nil value means don't show the file in the list."
:group 'speedbar
:type 'boolean)