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

For Meld on macOS, add this to your ~/.gitconfig as recommended by the maintainer of the macOS application, yousseb:

[diff]
  tool = meld
[difftool]
  prompt = false
[difftool "meld"]
  trustExitCode = true
  cmd = open -W -a Meld --args \"$LOCAL\" \"$REMOTE\"
[merge]
  tool = meld
[mergetool]
  prompt = false
[mergetool "meld"]
  trustExitCode = true
  cmd = open -W -a Meld --args --auto-merge \"$LOCAL\" \"$BASE\" \"$REMOTE\" --output=\"$MERGED\"

You can omit the merge configs if you would like.

@GutenYe's answer didn't work out for me due to automatic escaping and/or something with zsh.