Don't eat unhandled events in wxHtmlWindow::OnKeyUp().

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70835 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/htmlwin.cpp

@@ -1525,6 +1525,10 @@ void wxHtmlWindow::OnKeyUp(wxKeyEvent& event)
 
         GetEventHandler()->ProcessEvent(evt);
     }
+    else
+    {
+        event.Skip();
+    }
 }
 
 void wxHtmlWindow::OnCopy(wxCommandEvent& WXUNUSED(event))