Variable: secondary-tool-bar-map
secondary-tool-bar-map is a variable defined in tool-bar.el.gz.
Value
nil
Documentation
Optional secondary keymap for the tool bar.
If non-nil, tool bar items defined within this map are displayed
in a line below the tool bar if the tool-bar-position frame
parameter is set to top, and above the tool bar it is set to
bottom.
Probably introduced at or before Emacs version 30.1.
Source Code
;; Defined in /usr/src/emacs/lisp/tool-bar.el.gz
(defvar secondary-tool-bar-map nil
"Optional secondary keymap for the tool bar.
If non-nil, tool bar items defined within this map are displayed
in a line below the tool bar if the `tool-bar-position' frame
parameter is set to `top', and above the tool bar it is set to
`bottom'.")