@Nullable
  private GutterIconRenderer createIgnoreRenderer() {
    return createIconRenderer(DiffBundle.message("action.presentation.merge.ignore.text"), AllIcons.Diff.Remove,
                              () -> myViewer.executeCommand(DiffBundle.message("merge.dialog.ignore.change.command"),
                                                            () -> myViewer.markChangeResolved(this)));
  }
@Nullable
  private GutterIconRenderer createIgnoreRenderer()