When you merge branch A with branch B, you can then fast forward branch B to the merge commit. git merge even does this automatically. Such commits have 2 parents and 2 children.
On both branches 'git log --first-parent' shows the same history before the merge.
Is it true that in this case you can't filter commits by branch name in 'git log'?
I'm thinking of using 'git merge --no-ff' since now.