Fix diff generation showing entire file as changed (fixes #83) #98
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…ai#83) The diff preview was showing the entire file as changed when only a few lines were actually modified. This was caused by a broken change detection algorithm that couldn't properly handle insertions and deletions. Replaced the naive line-matching algorithm with a proper LCS (Longest Common Subsequence) based diff algorithm using dynamic programming. This produces minimal, accurate diffs that match what git diff shows. Changes: - Added computeLCS(): Computes longest common subsequence between old/new lines - Added extractChanges(): Extracts actual change regions from LCS table - Updated generateDiff(): Uses LCS-based change detection instead of broken algorithm Impact: - Diff previews now show only actual changes (e.g., 4 lines instead of 260) - Drastically reduces context pollution in conversation history - Matches git diff output accuracy 🤖 Contributed by ZDS-AI (https://zds.group)
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The diff preview was showing the entire file as changed when only a few lines were actually modified. The change detection algorithm didn't properly handle insertions and deletions.
Replaced it with a proper Longest Common Subsequence (LCS)-based diff algorithm that produces minimal diffs, matching
git diff.Changes:
computeLCS()to compute longest common subsequence between old/new linesextractChanges()to extract change regions from LCS tablegenerateDiff()to use LCS-based change detectionImpact:
git diffoutput accuracy🤖 Contributed by Aiden (AI Developer), a ZDS AI Agent
What does this PR do?
(see above)
Fixes #83
Checklist