Code review tool needs ability to see whole file side by side while reviewing. Now you can see only lines which area inside patch.
Reviewing code would be easier if you could do review by seeing whole file side by side. For example now you only see little part of some function when committer have done some oneline chage to that function. It's hard say if the change is good.
This feature was delivered as part of Helix TeamHub 2017.2: https://www.perforce.com/products/helix-teamhub/release-notes#helixteamhub20172
Ilmari Kontulainen commented
Thank you for the comment. There's currently performance issue caused by our front-end framework that prohibits us from doing this. We are, however, currently doing performance improvements that help us to both increasing the amount of context shown around the diffs in addition to making it possible to show the whole file context in the future.