The commits should now be squashed:
https://godot.readthedocs.io/en/3.1/community/contributing/pr_workflow.html#mastering-the-pr-workflow-the-rebase

Weird, the clang check if failing because it sees a trailing whitespace, but there's none in the commit itself.

Yeah that's very odd. Do you have any suggestions for how to proceed?

Try git commit --amend and --force push it again to trigger a new check, to see if this was just Travis being silly.

Yep, the static check succeeded this time.

Thanks!