Ref T345, clear model function

src/blackgui/guiutility.cpp

@@ -16,6 +16,7 @@
 #include <QApplication>
 #include <QCheckBox>
 #include <QComboBox>
+#include <QAbstractItemModel>
 #include <QJsonDocument>
 #include <QJsonObject>
 #include <QJsonValue>
@@ -412,6 +413,15 @@ namespace BlackGui
         return rows;
     }
 
+    int CGuiUtility::clearModel(QAbstractItemModel *model)
+    {
+        if (!model) { return 0; }
+        const int count = model->rowCount();
+        if (count < 1) { return 0; }
+        model->removeRows(0, count);
+        return count;
+    }
+
     bool CGuiUtility::isTopLevelWidget(QWidget *widget)
     {
         if (!widget) { return false; }