Fixes: - Avoid ugly toolbar by default on mac

src/plugins/coreplugin/navigationwidget.cpp

@@ -334,6 +334,10 @@ NavigationSubWidget::NavigationSubWidget(NavigationWidget *parentWidget)
 
     m_navigationComboBox = new NavComboBox(this);
     m_navigationWidget = 0;
+#ifdef Q_OS_MAC
+    // this is to avoid ugly tool bar behavior
+    m_navigationComboBox->setMaximumWidth(130);
+#endif
 
     m_toolbar = new QToolBar(this);
     m_toolbar->setContentsMargins(0, 0, 0, 0);