logic: Fixed crash when start screen was closed while checking for update

src/lib_gui/qt/element/QtUpdateCheckerWidget.cpp

@@ -58,19 +58,31 @@ QtUpdateCheckerWidget::QtUpdateCheckerWidget(QWidget* parent)
 	}
 }
 
+QtUpdateCheckerWidget::~QtUpdateCheckerWidget()
+{
+	if (m_deleteCheck)
+	{
+		*m_deleteCheck.get() = true;
+	}
+}
+
 void QtUpdateCheckerWidget::checkUpdate(bool force)
 {
-	ApplicationSettings* appSettings = ApplicationSettings::getInstance().get();
-	appSettings->setUpdateVersion(Version::getApplicationVersion());
-	appSettings->setUpdateDownloadUrl("");
-	appSettings->save();
-
 	m_button->setText("checking for update...");
 	m_button->setEnabled(false);
 
+	std::shared_ptr<bool> deleteCheck = std::make_shared<bool>(false);
+	m_deleteCheck = deleteCheck;
+
 	QtUpdateChecker::check(force,
-		[this, appSettings](QtUpdateChecker::Result result)
+		[deleteCheck, this](QtUpdateChecker::Result result)
 		{
+			bool deleted = *deleteCheck.get();
+			if (deleted)
+			{
+				return;
+			}
+
 			if (!result.success)
 			{
 				m_button->setText("update check failed");
@@ -82,10 +94,6 @@ void QtUpdateCheckerWidget::checkUpdate(bool force)
 			else
 			{
 				setDownloadUrl(result.url);
-
-				appSettings->setUpdateVersion(result.version);
-				appSettings->setUpdateDownloadUrl(result.url.toStdString());
-				appSettings->save();
 			}
 		}
 	);

src/lib_gui/qt/element/QtUpdateCheckerWidget.h

@@ -10,12 +10,15 @@ class QtUpdateCheckerWidget
 {
 public:
 	QtUpdateCheckerWidget(QWidget* parent = nullptr);
+	virtual ~QtUpdateCheckerWidget();
 
 private:
 	void checkUpdate(bool force);
 	void setDownloadUrl(QString url);
 
 	QPushButton* m_button;
+
+	std::shared_ptr<bool> m_deleteCheck;
 };
 
 #endif // QT_UPDATE_CHECKER_WIDGET_H

src/lib_gui/qt/network/QtUpdateChecker.cpp

@@ -32,6 +32,8 @@ void QtUpdateChecker::check(bool force, std::function<void(Result)> callback)
 
 	ApplicationSettings* appSettings = ApplicationSettings::getInstance().get();
 	appSettings->setLastUpdateCheck(TimeStamp::now());
+	appSettings->setUpdateVersion(Version::getApplicationVersion());
+	appSettings->setUpdateDownloadUrl("");
 	appSettings->save();
 
 	QString urlString = "https://www.sourcetrail.com/api/v1/versions/latest";
@@ -128,6 +130,10 @@ void QtUpdateChecker::check(bool force, std::function<void(Result)> callback)
 					result.url = url;
 
 					ApplicationSettings* appSettings = ApplicationSettings::getInstance().get();
+					appSettings->setUpdateVersion(updateVersion);
+					appSettings->setUpdateDownloadUrl(url.toStdString());
+					appSettings->save();
+
 					if (!force && appSettings->getSkipUpdateForVersion() == updateVersion)
 					{
 						break;