Fix for Qt versions before 5.6

GUI/coregui/Views/CommonWidgets/DocksController.cpp

@@ -56,9 +56,11 @@ void DocksController::onResetLayout()
         m_mainWindow->addDockWidget(it.second.area(), it.second.dock());
 
     // Fixes issue: https://bugreports.qt.io/browse/QTBUG-65592
+#if QT_VERSION >= 0x050600
     dockWidgetList = m_mainWindow->dockWidgets();
     if (dockWidgetList.size()>0)
         m_mainWindow->resizeDocks({dockWidgetList.first()}, {10}, Qt::Horizontal);
+#endif
 
     for (QDockWidget* dockWidget : dockWidgetList)
         dockWidget->show();