pull up r19629 from trunk

pull up r19629 from trunk

 r19629@cathode-dark-space:  jaltman | 2007-06-22 15:00:27 -0400
 ticket: 5584

 Be more aggressive about forcing the new credentials dialog to the
 top.

 Many applications call GSSAPI functions from the main GUI thread.
 Doing so blocks the window message pump for that application.  When
 the GSSAPI call results in the new credentials dialog being displayed,
 it will be unable to bring itself to the top and grab the user input
 focus because the foreground window is not responding.  This patch
 makes the new credentials window a top-most window at creation time
 that results in it being created at the top of the Z-order.  It can
 then flash the window to indicate that it requires user attention.

ticket: 5584

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@19787 dc483132-0cff-0310-8789-dd5450dbe970