From: smcv@debian.org 
  
 On Sat, 16 Aug 2025 at 14:58:56 -0700, Russ Allbery wrote: 
 >Right, this is what I was talking about with incremental reviews. GitHub 
 >now supports showing you only the differences since the last time you 
 >reviewed it. 
  
 For what it's worth, Gitlab can also show you the differences between 
 arbitrary revisions of a merge request. For example in 
 https://salsa.debian.org/ci-team/autopkgtest/-/merge_requests/583 you 
 can see (behind the "Compare with previous version" link) that I applied 
 some lint fixes between v1 and v2. 
  
 Similarly in 
 https://salsa.debian.org/ci-team/autopkgtest/-/merge_requests/583/diffs, 
 the toolbar that says "Compare [master] and [latest version]" would let 
 you compare any pair of versions of the MR (for this particular MR there 
 are not many to choose between). 
  
 Viewing commit-by-commit doesn't have that feature available, but that's 
 probably unavoidable, because... 
  
 >I agree that it's not quite as good as Gerrit at showing you deltas 
 >between arbitrary revisions of the patch 
  
 ... Github, Gitlab, and the git data model in general don't really have 
 any concept of what is "a different revision of the same patch" - the 
 only information they have is an earlier version of the pull/merge 
 request (a base commit + a patch series), and a later version (base 
 commit + patch series again). Gerrit can identify that you think a 
 commit is "the same" by it keeping a previously-used Change-ID, but 
 without enforcing that information being present, Github and Gitlab 
 can't know that you consider two commits with very similar commit 
 messages or very similar diffs to be "the same thing". 
  
 In practice I usually prefer to review commit-by-commit for a first pass 
 or when there have been significant changes, or "Compare with previous 
 version" for a quick check that previous review feedback has been taken 
 into account. 
  
      smcv 
  
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