Adjust width of SelectProductDialog's side panel according to its contents.

The width is determined at runtime based on the largest page in the
QTabWidget.  Without this fix, the side panel would annoyingly change
width as you selected the search tab for the first time -- this was
particularly annoying in the de_DE locale.

glabels/NotebookUtil.h

@@ -0,0 +1,40 @@
+/*  NotebookUtil.h
+ *
+ *  Copyright (C) 2015  Jim Evins <evins@snaught.com>
+ *
+ *  This file is part of gLabels-qt.
+ *
+ *  gLabels-qt 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.
+ *
+ *  gLabels-qt 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 for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef model_NotebookUtil_h
+#define model_NotebookUtil_h
+
+
+#include <QWidget>
+#include <QTabWidget>
+
+
+namespace glabels
+{
+	namespace NotebookUtil
+	{
+
+		void establishSize( QTabWidget* notebook );
+
+	}
+}
+
+
+#endif // model_NotebookUtil_h