Related: tdf#158534 set fallback help page for optional print content

Change-Id: I79d843cbf2591ab5a8625087e2ec5897b26a8056
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160371
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>
(cherry picked from commit e507fd525404d5ac078a47650df11e5e18a88a81)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160358
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
diff --git a/vcl/source/window/printdlg.cxx b/vcl/source/window/printdlg.cxx
index b83d516..4ea3c6c 100644
--- a/vcl/source/window/printdlg.cxx
+++ b/vcl/source/window/printdlg.cxx
@@ -1330,6 +1330,7 @@ void PrintDialog::setupOptionalUI()
            rOption.Value >>= sOptionsUIFile;
            mxCustomOptionsUIBuilder = Application::CreateBuilder(mxCustom.get(), sOptionsUIFile);
            std::unique_ptr<weld::Container> xWindow = mxCustomOptionsUIBuilder->weld_container("box");
            xWindow->set_help_id("vcl/ui/printdialog/PrintDialog");
            xWindow->show();
            continue;
        }