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Is it possible for a Gtk::Widget, say a Gtk::Button to fill the Gtk::HeaderBar completely vertically? If it is indeed possible, how is this achieved?

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As seen in the above picture, there seems to be a small space between the top and bottom end of the HeaderBar, no matter if Button::set_vexpand(true), Button::set_margin(0), HeaderBar::set_margin(0) or HeaderBar::set_spacing(0) are called.

Andy Ef
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  • I don't think you can achieve it directly. You may have to tweak the presentation using CSS. In my opinion, however, unless you have a very good reason to do this, I think it's better not "fighting" the framework. – BobMorane Aug 02 '21 at 15:58

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