Fix problem painting a new tip window (with alpha) over a dirty (non-validated) area in tool-bar.

src/widgets/toolbar.cpp

@@ -515,6 +515,10 @@ void ToolBar::closeTipWindow()
     m_tipWindow->closeWindow(NULL);
     delete m_tipWindow;
     m_tipWindow = NULL;
+
+    // Flush JM_DRAW messages and send them
+    jwidget_flush_redraw(ji_get_default_manager());
+    jmanager_dispatch_messages(ji_get_default_manager());
   }
 }