Changeset 11 is created by hg graft -r10 with revision 8 as parent:

hgtest default-r13 (tip) ~/ottd/grfdev/hgtest $ hg glog -l5
@    default-13:23dc5332e264 tip 2015-10-23 14:57 +0200 (planetmaker)
|\      Merge with head where foo is not removed but changeset grafted where its ancestor had foo removed
| |
| o  default-12:de1b51c3c9ae 2015-10-23 14:57 +0200 (planetmaker)
| |     Add baz
| |
o |  default-11:6417b49e7303 2015-10-23 14:55 +0200 (planetmaker)
|/      7 bars
|
| o  default-10:8fd815cb6ab9 b1 2015-10-23 14:55 +0200 (planetmaker)
| |     7 bars
| |
| o  default-9:a56b77ede925 2015-10-23 14:55 +0200 (planetmaker)
|/      Remove foo
|
hgtest default-r13 (tip) ~/ottd/grfdev/hgtest $ ls
bar baz  foo