Fix correct diff view for PR review comments in PR view page (#14002)
Fixes #13683. The diff snippet that provides context for a code review comment on the pull request timeline page used to be calculated based on the headCommitID. But in 1.13, with PR #13448, this changed to the commitID from the blame for the commented line, which seems to cause these incorrect review comment diff snippets. Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
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			@ -167,16 +167,16 @@ func createCodeComment(doer *models.User, repo *models.Repository, issue *models
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	// Only fetch diff if comment is review comment
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	if len(patch) == 0 && reviewID != 0 {
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		if len(commitID) == 0 {
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			commitID, err = gitRepo.GetRefCommitID(pr.GetGitRefName())
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			if err != nil {
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				return nil, fmt.Errorf("GetRefCommitID[%s]: %v", pr.GetGitRefName(), err)
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			}
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		headCommitID, err := gitRepo.GetRefCommitID(pr.GetGitRefName())
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		if err != nil {
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			return nil, fmt.Errorf("GetRefCommitID[%s]: %v", pr.GetGitRefName(), err)
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		}
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		if len(commitID) == 0 {
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			commitID = headCommitID
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		}
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		patchBuf := new(bytes.Buffer)
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		if err := git.GetRepoRawDiffForFile(gitRepo, pr.MergeBase, commitID, git.RawDiffNormal, treePath, patchBuf); err != nil {
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			return nil, fmt.Errorf("GetRawDiffForLine[%s, %s, %s, %s]: %v", gitRepo.Path, pr.MergeBase, commitID, treePath, err)
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		if err := git.GetRepoRawDiffForFile(gitRepo, pr.MergeBase, headCommitID, git.RawDiffNormal, treePath, patchBuf); err != nil {
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			return nil, fmt.Errorf("GetRawDiffForLine[%s, %s, %s, %s]: %v", gitRepo.Path, pr.MergeBase, headCommitID, treePath, err)
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		}
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		patch = git.CutDiffAroundLine(patchBuf, int64((&models.Comment{Line: line}).UnsignedLine()), line < 0, setting.UI.CodeCommentLines)
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	}
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