Does this patch fix this bug?
https://bugzilla.gnome.org/show_bug.cgi?id=641630
> _______________________________________________
On 04/23/2014 07:27 AM, Terence Ferraro wrote:
> Not sure if anyone else will find this of use, but, as of 3.12 a
> titlebar is provided for back-ends that do not provide their own (e.g.
> Broadway) and are quite sleek. Broadway made the shift to this at the
> same time away from client side decorations. Regular windows show the
> close button; dialogs do not. Not really sure if that's intentional, but...
>
> The attached diff adds such a close button by default to a dialog (code
> mostly borrowed from gtkwindow.c).
>
>
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