It’s impossible to copy code from a diff, since lines on the right side - as well as some line numbers - are copied as well. This was reported by colleagues who have a habit of copying parts of a diff in order to discuss them elsewhere.
Feel free to close this if you believe it to be a feature request. We’re currently evaluating Phabricator and I’m reporting all UX issues we found, in case you want to fix them.
Select code on only one side of the diff, and do not include line numbers.
2019 Week 4, deployed using openshift-phabricator (permalink).
Reproducible on a clean deployment (config), using a random diff from LKML.