View differences of branches with meld?

Question

I know that I can view the difference between HEAD and current state with meld .. But how can I view the differences between branches, for example master<

Answer 1

I think a easy way for doing this is using git reset --soft:

Goal: compare differences between branch_a and branch_b with meld

git checkout branch_a
git checkout -b do_diff
git reset --soft branch_b
meld .