This came up when trying to get the whole company use Phabricator.
In GitHub, each inline comment is shown with its context:
And you can interact with it by reply the comment.
In Phabricator, we only show the comment text with a line number. However, this can be inconvenient when a diff is updated; the user has to click on the line number and open a new tab to see a previous comment.
It would be really nice that one doesn't have to open a new tab to see the context of comments in previous diffs.
Also -- if the comment is for a block of code that is not changed between two diffs, probably make sense to also show it in the latest diff?