id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc
1194,null passed to makeNewGObject in handler for setFocusChild,guest,somebody,"The following code crashes with

Crash: user error (makeNewGObject: object is NULL)

This happens with gtk-0.11.0 and the latest code from the darcs repository.  There is a similar error with Window.onSetFocus/afterSetFocus.

import Graphics.UI.Gtk as Gtk

main = do
  initGUI
  window <- windowNew
  nb <- notebookNew
  entry1 <- entryNew
  entry2 <- entryNew


  set nb [ containerChild := entry1,
           containerChild := entry2 ]

  set window [ containerBorderWidth := 8,
               windowTitle := ""Crash Me"",
               containerChild := nb ]

  -- apparently the widget in this signal can be null
  on nb setFocusChild $ \w -> widgetGetName w >>= putStrLn >> return ()

  widgetGrabFocus entry1
  notebookNextPage nb -- CRASH!

  widgetShowAll window
  mainGUI
",defect,closed,normal,0.11.0,"general (Gtk+, Glib)",0.11.0,fixed,null setFocusChild,