Ubuntusso: Do not use dialog button on headerbar in Unity
In, unity we use gtk3-nocsd, which just adds a titlebar on top headerbar. But with ubuntusso dialog there is no action button on the dialog. Reported here.
I am not sure why gtk3-nocsd is causing the issue because it works ok with other dialog header. But for now we either use gtk-dialogs-use-header
(under unity it returns false for me,) or xdg-current-desktop to paint the dialog without headerbar button selectively under unity.
Edited by Khurshid Alam