hint window pane should always be shown so that hints will be drawn for even currently hidden panes being dragged around

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40091 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/aui/framemanager.cpp

@@ -2629,6 +2629,7 @@ void wxFrameManager::DrawHintRect(wxWindow* pane_window,
     wxDockUIPartArray uiparts;
     wxPaneInfo hint = GetPane(pane_window);
     hint.name = wxT("__HINT__");
+    hint.Show();
 
     if (!hint.IsOk())
         return;