ui: Window focus event sent when application changes state instead of main window

* Fixes tooltip disappearing when clicked on Windows

src/lib_gui/qt/QtApplication.cpp

@@ -4,12 +4,15 @@
 
 #include "utility/file/FilePath.h"
 #include "utility/messaging/type/MessageLoadProject.h"
+#include "utility/messaging/type/MessageWindowFocus.h"
 #include "utility/logging/LogManager.h"
+
 #include "component/controller/LogController.h"
 
 QtApplication::QtApplication(int& argc, char** argv)
 	: QApplication(argc, argv)
 {
+	connect(this, &QGuiApplication::applicationStateChanged, this, &QtApplication::onApplicationStateChanged);
 }
 
 int QtApplication::exec()
@@ -41,3 +44,8 @@ bool QtApplication::event(QEvent *event)
 
 	return QApplication::event(event);
 }
+
+void QtApplication::onApplicationStateChanged(Qt::ApplicationState state)
+{
+	MessageWindowFocus(state == Qt::ApplicationActive).dispatch();
+}