When "arc diff --create" is executed against several local commits, create one diff for each local commit. It can be enabled with an command option or just set as default.you run `arc diff` on a range of commits, Several engineers (including Girish an me) thinkwe currently smush the local commits are useful in code reviewm all together and discard information.
We may also do similar thing in "arc diff --update" to make it add extra local commit**s**.
(Is that "one diff in Revision history" or "one Revision"?)For example, `arc diff HEAD^^^^^` followed by `arc patch` produces a single local commit. Instead, it should produce 5 local commits.