[PATCH] Fix pinentry-gtk-2 SIGSEGV when unfocusing with -g argument

[Stanislav Ochotnicky]

Hi everyone,

I am including a fix for pinentry-gtk-2 SIGSEGV bug when using
--no-global-grab option.

gdk_window_set_transient_for cannot be used with parent = NULL to
unset transient hint (unlike gtk_ version which can). Replacement
code is taken from gtk_window_transient_parent_unrealized

Applied cleanly at least over 0.8.0 and 0.7.6

More info see: https://bugzilla.redhat.com/show_bug.cgi?id=520236


-- 
Stanislav Ochotnicky <sochotnicky at redhat.com>
Associate Software Engineer - Base Operating Systems Brno

Mobile: +420 775 633 759
Red Hat Inc.                               http://cz.redhat.com

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