@Nullable
  private DiffGutterOperation createOperation(@NotNull ThreeSide side, @NotNull DiffGutterOperation.ModifiersRendererBuilder builder) {
    if (isResolved(side)) return null;

    EditorEx editor = myViewer.getEditor(side);
    int offset = DiffGutterOperation.lineToOffset(editor, getStartLine(side));

    return new DiffGutterOperation.WithModifiers(editor, offset, myViewer.getModifierProvider(), builder);
  }
@Nullable
  private DiffGutterOperation createOperation(@NotNull ThreeSide side, @NotNull DiffGutterOperation.ModifiersRendererBuilder builder)