To configure diffuse as merge tool I set mergetool configuration using following commands:
git config --global merge.tool diffuse git config --global mergetool.diffuse.cmd '/usr/bin/diffuse "$LOCAL" "$MERGED" "$REMOTE"'
Then, when I invoke mergetool during merge, I get diffuse with four panes open as by default, instead of three specified in command line setting. Is this an expected behavior, and how can I force mergetool to use provided command line?