Fix search field not always taking focus on startup

- Not sure if this is bug in Qt, but not setting the parent for
  ToolBar in the constructor seems to fix the issue

Author: juzzlin

src/view/main_window.cpp

@@ -53,7 +53,7 @@ MainWindow::MainWindow()
   : m_aboutDlg(new Dialogs::AboutDialog(this))
   , m_settingsDlg(new Dialogs::SettingsDialog(this))
   , m_spinnerDlg(new Dialogs::SpinnerDialog(this))
-  , m_toolBar(new Menus::ToolBar(this))
+  , m_toolBar(new Menus::ToolBar)
   , m_whatsNewDlg(new Dialogs::WhatsNewDialog(this))
   , m_connectSelectedNodesAction(new QAction(tr("Connect selected nodes"), this))
   , m_disconnectSelectedNodesAction(new QAction(tr("Disconnect selected nodes"), this))

src/view/menus/tool_bar.cpp

@@ -33,9 +33,8 @@
 
 namespace Menus {
 
-ToolBar::ToolBar(QWidget * parent)
-  : QToolBar(parent)
-  , m_autoSnapCheckBox(new QCheckBox(tr("Auto snap"), this))
+ToolBar::ToolBar()
+  : m_autoSnapCheckBox(new QCheckBox(tr("Auto snap"), this))
   , m_copyOnDragCheckBox(new QCheckBox(tr("Copy on drag"), this))
   , m_cornerRadiusSpinBox(new QSpinBox(this))
   , m_arrowSizeSpinBox(new QDoubleSpinBox(this))

src/view/menus/tool_bar.hpp

@@ -39,7 +39,7 @@ class ToolBar : public QToolBar
     Q_OBJECT
 
 public:
-    ToolBar(QWidget * parent = nullptr);
+    ToolBar();
 
     bool autoSnapEnabled() const;