Fix Summary Multiplot subplot colspan issue (#8805)

Fix colspan bug for summary multiplots

ApplicationLibCode/UserInterface/RiuSummaryMultiPlotBook.h

@@ -0,0 +1,42 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2022     Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+#include "RiuMultiPlotBook.h"
+
+class RimSummaryMultiPlot;
+class RiuSummaryMultiPlotPage;
+
+//==================================================================================================
+//
+//
+//==================================================================================================
+class RiuSummaryMultiPlotBook : public RiuMultiPlotBook
+{
+    Q_OBJECT
+
+public:
+    RiuSummaryMultiPlotBook( RimSummaryMultiPlot* plotDefinition, QWidget* parent = nullptr );
+    ~RiuSummaryMultiPlotBook() override;
+
+protected:
+    void createPages() override;
+
+private:
+    RiuSummaryMultiPlotPage* createSummaryPage();
+};