I use GitLab diffs in single-file-view mode, TortoiseGit Merge when it exceeds what GitLab can reasonably display (including block indent changes I can ignore in TortoiseGit Merge or moves I can better track), and WinMerge (previously I used KDiff) for manual copy-paste text diffing (like copying blocks from the code change diff to compare similar, categorically similar code, or code moves, etc)
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