I'd like to use lab hub wrapper for handling mr/issues of my own custom gitlab server. When I open a pull-request using hub (github) it's works fine the git-commit-mode from magit, syntax highlight working and C-c C-c / C-c C-k keybindings for commit/abort.
However for lab doens't works. Seems that I need setup something in my config to the MERGE_EDITMSG buffer can work. After opening a mr https://i.stack.imgur.com/vARyL.png using
lab mr create. I cannot abort easily and there is no syntax highlight too. To complete the commit it's necessary just C-x C-c, it's ok, but would be better to be consistent with the rest o magit stuff.