Merge branch 'lp/maint-diff-three-dash-with-graph' into maint

"log -p --graph" used with "--stat" had a few formatting error.

By Lucian Poston
* lp/maint-diff-three-dash-with-graph:
  t4202: add test for "log --graph --stat -p" separator lines
  log --graph: fix break in graph lines
  log --graph --stat: three-dash separator should come after graph lines

diff --cc diff.c
Simple merge

diff --cc log-tree.c
Simple merge

diff --cc t/t4202-log.sh
Simple merge