GH-1873 allow closing main window, fix window ref count

application/MainWindow.cpp

@@ -1403,28 +1403,11 @@ void MainWindow::on_actionViewSelectedInstFolder_triggered()
 
 void MainWindow::closeEvent(QCloseEvent *event)
 {
-	if(MMC->numRunningInstances())
-	{
-		auto resBtn = QMessageBox::question(
-			this,
-			tr("Do you want to close MultiMC?"),
-			tr("<p>You still have instances running.</p><p>Closing MultiMC will result in inaccurate time tracking and no Minecraft crash handling.</p><p>Are you sure?</p>"),
-			QMessageBox::No | QMessageBox::Yes,
-			QMessageBox::Yes
-		);
-		if (resBtn != QMessageBox::Yes)
-		{
-			event->ignore();
-			return;
-		}
-	}
-
-	// no running instances or user said yes.
-	event->accept();
 	// Save the window state and geometry.
 	MMC->settings()->set("MainWindowState", saveState().toBase64());
 	MMC->settings()->set("MainWindowGeometry", saveGeometry().toBase64());
-	QApplication::exit();
+	event->accept();
+	emit isClosing();
 }
 
 void MainWindow::changeEvent(QEvent* event)

application/MainWindow.h

@@ -54,6 +54,9 @@ public:
 
 	void checkInstancePathForProblems();
 
+signals:
+	void isClosing();
+
 private slots:
 	void onCatToggled(bool);
 

application/MultiMC.cpp

@@ -444,8 +444,6 @@ void MultiMC::performMainStartupAction()
 		auto inst = instances()->getInstanceById(m_instanceIdToLaunch);
 		if(inst)
 		{
-			// minimized main window
-			showMainWindow(true);
 			launch(inst, true, nullptr);
 			return;
 		}
@@ -1020,7 +1018,7 @@ void MultiMC::controllerSucceeded()
 	if(m_openWindows == 0 && m_runningInstances == 0)
 	{
 		m_status = Status::Succeeded;
-		quit();
+		exit(0);
 	}
 }
 
@@ -1041,7 +1039,7 @@ void MultiMC::controllerFailed(const QString& error)
 	if(m_openWindows == 0 && m_runningInstances == 0)
 	{
 		m_status = Status::Failed;
-		quit();
+		exit(1);
 	}
 }
 
@@ -1068,6 +1066,7 @@ MainWindow* MultiMC::showMainWindow(bool minimized)
 		}
 
 		m_mainWindow->checkInstancePathForProblems();
+		connect(m_mainWindow, &MainWindow::isClosing, this, &MultiMC::on_windowClose);
 		m_openWindows++;
 	}
 	// FIXME: move this somewhere else...
@@ -1157,9 +1156,9 @@ void MultiMC::on_windowClose()
 		m_mainWindow = nullptr;
 	}
 	// quit when there are no more windows.
-	if(m_openWindows == 0)
+	if(m_openWindows == 0 && m_runningInstances == 0)
 	{
-		quit();
+		exit(0);
 	}
 }