void appendNumberedLineInfo(final int lineNumber, @NotNull CommitInfo info, @Nullable CommitInfo mergeInfo) {
      if (myMappedLineInfo.get(lineNumber) != null) return;
      myMaxIdx = Math.max(myMaxIdx, lineNumber);
      myMappedLineInfo.put(lineNumber, info);
      if (mergeInfo != null) {
        myMergeSourceInfos.put(lineNumber, mergeInfo);
      }
    }
void appendNumberedLineInfo(final int lineNumber, @NotNull CommitInfo info, @Nullable CommitInfo mergeInfo)