The safest rule to follow is not changing the formatting style of existing code unless it is done as a separate pull request. Regardless of the project you are contributing to, this will maximize the chance of your pull request getting merged without feedback requesting changes. Considering the number of projects I contribute to and the widely varying style practices used by them, I've started using a visual diff tool with visible whitespace enabled to catch unintended differences before submitting a pull request. :+1: