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