Qt: Make 'About Qt' action actually open the about box

Source/Core/DolphinQt/MainWindow.cpp

@@ -78,6 +78,7 @@ DMainWindow::DMainWindow(QWidget* parent_widget)
 	connect(m_ui->actionGitHub, SIGNAL(triggered()), this, SLOT(OnOpenGitHub()));
 	connect(m_ui->actionSystemInfo, SIGNAL(triggered()), this, SLOT(OnOpenSystemInfo()));
 	connect(m_ui->actionAbout, SIGNAL(triggered()), this, SLOT(OnOpenAbout()));
+	connect(m_ui->actionAboutQt, SIGNAL(triggered()), this, SLOT(OnOpenAboutQt()));
 
 	// Update GUI items
 	emit CoreStateChanged(Core::CORE_UNINITIALIZED);
@@ -362,3 +363,8 @@ void DMainWindow::OnOpenAbout()
 	DAboutDialog* dlg = new DAboutDialog(this);
 	dlg->open();
 }
+
+void DMainWindow::OnOpenAboutQt()
+{
+	QApplication::aboutQt();
+}

Source/Core/DolphinQt/MainWindow.h

@@ -58,6 +58,7 @@ private slots:
 	void OnOpenGitHub();
 	void OnOpenSystemInfo();
 	void OnOpenAbout();
+	void OnOpenAboutQt();
 
 	// Misc.
 	void UpdateIcons();