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();
+}

src/lib_gui/qt/QtApplication.h

@@ -6,11 +6,16 @@
 class QtApplication
 	: public QApplication
 {
+	Q_OBJECT
+
 public:
 	QtApplication(int& argc, char** argv);
 
 	bool event(QEvent *event);
 	int exec();
+
+private slots:
+	void onApplicationStateChanged(Qt::ApplicationState state);
 };
 
 #endif // QT_APPLICATION_H

src/lib_gui/qt/window/QtMainWindow.cpp

@@ -45,7 +45,6 @@
 #include "utility/messaging/type/MessageSearch.h"
 #include "utility/messaging/type/MessageUndo.h"
 #include "utility/messaging/type/MessageWindowClosed.h"
-#include "utility/messaging/type/MessageWindowFocus.h"
 #include "utility/messaging/type/MessageZoom.h"
 #include "utility/ResourcePaths.h"
 #include "utility/tracing.h"
@@ -346,20 +345,6 @@ void QtMainWindow::setContentEnabled(bool enabled)
 	}
 }
 
-bool QtMainWindow::event(QEvent* event)
-{
-	if (event->type() == QEvent::WindowActivate)
-	{
-		MessageWindowFocus(true).dispatch();
-	}
-	else if (event->type() == QEvent::WindowDeactivate)
-	{
-		MessageWindowFocus(false).dispatch();
-	}
-
-	return QMainWindow::event(event);
-}
-
 void QtMainWindow::keyPressEvent(QKeyEvent* event)
 {
 	switch (event->key())

src/lib_gui/qt/window/QtMainWindow.h

@@ -79,7 +79,6 @@ public:
 	void setContentEnabled(bool enabled);
 
 protected:
-	bool event(QEvent* event);
 	void keyPressEvent(QKeyEvent* event);
 	void contextMenuEvent(QContextMenuEvent* event);
 	void closeEvent(QCloseEvent* event);