texinfo-update-menu-region-beginning
texinfo-update-menu-region-beginning is a compiled Lisp function in `texnfo-upd.el
'.
(texinfo-update-menu-region-beginning LEVEL)
Locate beginning of higher level section this section is within.
Return position of the beginning of the node line; do not move point.
Thus, if this level is subsection, searches backwards for section node.
Only argument is a string of the general type of section.