When you push branches while using the “Pull requests” tab, GitHub will now display the dynamic “Compare and pull request” widget—so you can quickly create a pull request without having to switch back to the “Code” tab. Learn more about pull requests in our documentation.
Collapse all diffs in a pull request at once
When a pull request contains a lot of changed files, code reviewers can find it hard to isolate the changes that are relevant to them. Now you can collapse (or expand) the contents of all diffs in a pull request by holding down the alt key and clicking on the inverted caret icon in any file header.
You can then go one step further by using the “Jump to file or symbol” dropdown to jump to the file that you’re interested in and automatically expand it. Happy code reviewing!