add 50 histories for histroy rendering

Change-Id: I26ff4655d682960ef397be27d5a9fc894502cf8a
Reviewed-on: https://gerrit.libreoffice.org/11579
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
Tested-by: Kohei Yoshida <libreoffice@kohei.us>