muttrc trick

# this toggles the index when viewing a message. Thanks to
# originally from http://lists.df7cb.de/mutt/message/19980210.111937.0a751738.ca.html  (now gone)
macro pager \e\e0 "<enter-command>set pager_index_lines=6\n<enter-command>macro pager I \\e\\e1\n"
macro pager \e\e1 "<enter-command>set pager_index_lines=0\n<enter-command>macro pager I \\e\\e0\n"
macro pager I "\e\e1"   "toggle mini index"
set pager_index_lines=6