Hi all,

While writing some tests for my app in testrunner, I stumbled over some 
exceptions on widget dispose which made the tests fail.

The relevant part of my test is as follows:

       window.close();
       window.dispose();

       this.assertTrue(window.isDisposed());

Running this test gives the following (again relevant part only) exception:

Error message is:
TypeError: Cannot read property 'isNativelyFocusable' of null
Stack trace:
qx.ui.core.Widget:2883:19
qx.core.Property:701:27), :3:624

It seems that after disposal the qx queues are still flushing changes to 
the widget properties and fail if the content element was already 
removed, thus this.getContentElement() or this.getFocusElement() are 
returning null.

This behaviour is simply reproducible with the following playground example

     http://tinyurl.com/zynqxop

Please click the button while having the log view open. You'll see the 
exception occuring. You may need to click on the playgrounds run button 
again to see the exception appear in the log window.

Im not 100% sure but I think that the tests succeeded in qx 4.1, which 
means that there must have been some changes in the disposal logic or 
queue logic since.

Any help or idea would be great.

Regards
Dietrich


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