ui: Fixed escaping and interrupting

* Fixed crash when closing window with ESCAPE
* Fixed interrupt status message not showing when interrupting parsing

src/lib/utility/scheduling/TaskScheduler.cpp

@@ -25,7 +25,15 @@ void TaskScheduler::pushTask(std::shared_ptr<Task> task)
 void TaskScheduler::pushNextTask(std::shared_ptr<Task> task)
 {
 	std::lock_guard<std::mutex> lock(m_tasksMutex);
-	m_tasks.push_front(task);
+
+	if (m_tasks.size() == 0)
+	{
+		m_tasks.push_front(task);
+	}
+	else
+	{
+		m_tasks.insert(m_tasks.begin() + 1, task);
+	}
 }
 
 void TaskScheduler::interruptCurrentTask()
@@ -142,15 +150,14 @@ void TaskScheduler::updateTasks()
 	while (m_tasks.size())
 	{
 		std::shared_ptr<Task> task = m_tasks.front();
-		m_tasks.pop_front();
 
 		m_tasksMutex.unlock();
 		Task::TaskState state = task->process(interrupt);
 		m_tasksMutex.lock();
 
-		if (state != Task::STATE_FINISHED && state != Task::STATE_CANCELED)
+		if (state == Task::STATE_FINISHED || state == Task::STATE_CANCELED)
 		{
-			m_tasks.push_front(task);
+			m_tasks.pop_front();
 		}
 
 		interrupt = m_interruptTask;

src/lib_gui/qt/window/QtMainWindow.cpp

@@ -483,7 +483,6 @@ void QtMainWindow::toggleView(View* view, bool fromMenu)
 
 void QtMainWindow::handleEscapeShortcut()
 {
-	m_windowStack.popWindow();
 	MessageInterruptTasks().dispatch();
 }
 

src/lib_gui/qt/window/QtWindow.cpp

@@ -260,6 +260,7 @@ void QtWindow::keyPressEvent(QKeyEvent *event)
 	if (m_cancelAble && event->key() == Qt::Key_Escape)
 	{
 		emit canceled();
+		return;
 	}
 
 	QWidget::keyPressEvent(event);