correct

Author: wxiaoguang

modules/git/diff.go

@@ -120,11 +120,9 @@ func ParseDiffHunkString(diffHunk string) (leftLine, leftHunk, rightLine, rightH
 		rightHunk = leftHunk
 	}
 	if rightLine == 0 {
-		// "git diff" outputs 2 different formats for the same change "OLD" => "A\nB\nC"
-		// * "@@ -1 +1,3 @@": the expected result
-		// * "@@ -1,1 +0,4 @@": the "0" means "insert before the first line"
+		// FIXME: GIT-DIFF-CUT-BUG search this tag to see details
+		// this is only a hacky patch, the rightLine&rightHunk might still be incorrect in some cases.
 		rightLine++
-		rightHunk--
 	}
 	return leftLine, leftHunk, rightLine, rightHunk
 }
@@ -277,6 +275,11 @@ func CutDiffAroundLine(originalDiff io.Reader, line int64, old bool, numbersOfLi
 			oldNumOfLines++
 		}
 	}
+
+	// "git diff" outputs "@@ -1 +1,3 @@" for "OLD" => "A\nB\nC"
+	// FIXME: GIT-DIFF-CUT-BUG But there is a but in CutDiffAroundLine, then the "Patch" stored in the comment model becomes "@@ -1,1 +0,4 @@"
+	// It may generate incorrect results for difference cases, for example: delete 2 line add 1 line, delete 2 line add 2 line etc, need to double check.
+
 	// construct the new hunk header
 	newHunk[headerLines] = fmt.Sprintf("@@ -%d,%d +%d,%d @@",
 		oldBegin, oldNumOfLines, newBegin, newNumOfLines)