Adds a header bar to a #HdyHeaderGroup. The decoration layout of the
widgets will be edited depending on their position in the composite header
bar, the start widget displaying only the start of the user's decoration
layout and the end widget displaying only its end while widgets in the middle
won't display anything. A header bar can be set as having the focus to
display all the decorations. See gtk_header_bar_set_decoration_layout().
When the widget is destroyed or no longer referenced elsewhere, it will
be removed from the header group.
Adds a header bar to a #HdyHeaderGroup. The decoration layout of the widgets will be edited depending on their position in the composite header bar, the start widget displaying only the start of the user's decoration layout and the end widget displaying only its end while widgets in the middle won't display anything. A header bar can be set as having the focus to display all the decorations. See gtk_header_bar_set_decoration_layout().
When the widget is destroyed or no longer referenced elsewhere, it will be removed from the header group.