forked from amazingfate/help
+ some Navigators uses "arrows" instead of + and - to indicate
expanding and collapsing headings, so added this possibility
Change-Id: Ie571c5a6c651dbdb794e5b9bda9e21d09c6b16d8
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/106131
Tested-by: Jenkins
Reviewed-by: Seth Chaiklin <sdc.blanco@youmail.dk>