the footnote stream is parsed completely at each footnote insertion
(line) breaks outside of the requested footnote need to be skipped
test include

Change-Id: I78de7774b7daf44c2b8980115870082fc56924bd
Reviewed-on: https://gerrit.libreoffice.org/19228Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>