Overview of Changes in GAIL 1.6.4
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* Prevent warning message because of nreferrring to non-existent child.
(bug #141494)

* Report labels correctly for GnomeFontPicker (bug #140616)

* Ensure that focus object for widget is not defunct before reporting
focus on it. (bug #141907)

* Set button press as default action for button consisting of a down arrow.
(bug #137401)