Hello,
recently we noticed that when commenting on an issue @Mergifyio backport branch-xx will create the PR even in presence of conflicts.

Is it possible to change the default behaviour to avoid creating the PR if there are conflicts in the configuration file?
Or we'll have to always add --ignore-conflicts=false manually?

Looking at the documentation we can't find a way to set default

It's perfectly possible that one of stdout/stderr is redirected to terminal (sys.X.isatty()=True), and the the other is not. As for now, we check isatty for stdout, and apply this setting to stderr as well.