ui: Fixed issues related to refresh

* don't clear single file code view on ui refresh
* don't refresh ui when clicking refresh
* do ui refresh with Alt + Refresh

src/lib_gui/qt/window/QtMainWindow.cpp

@@ -641,7 +641,14 @@ void QtMainWindow::closeWindow()
 
 void QtMainWindow::refresh()
 {
-	MessageRefresh().dispatch();
+	if (Qt::KeyboardModifier::AltModifier & QApplication::keyboardModifiers())
+	{
+		MessageRefresh().refreshUiOnly().dispatch();
+	}
+	else
+	{
+		MessageRefresh().dispatch();
+	}
 }
 
 void QtMainWindow::forceRefresh()