refs #640, find COverlayMessagesFrame in widget hierarchy

src/blackgui/guiutility.h

@@ -22,6 +22,8 @@
 
 namespace BlackGui
 {
+    class COverlayMessagesFrame;
+
     //! GUI utilities
     class BLACKGUI_EXPORT CGuiUtility
     {
@@ -65,6 +67,9 @@ namespace BlackGui
         //! Meta type id from dropped data
         static int metaTypeIdFromSwiftDragAndDropData(const QMimeData *mime);
 
+        //! Find next BlackGui::COverlayMessages QFrame
+        static COverlayMessagesFrame *nextOverlayMessageFrame(QWidget *widget, int maxLevels = 10);
+
         //! Metatype
         static const QString &swiftJsonDragAndDropMimeType();