Removes a child from the GtkHeaderBar.
The child must have been added with [method@Gtk.HeaderBar.pack_start], [method@Gtk.HeaderBar.pack_end] or [method@Gtk.HeaderBar.set_title_widget].
the child to remove
See Implementation
Removes a child from the GtkHeaderBar.
The child must have been added with [method@Gtk.HeaderBar.pack_start], [method@Gtk.HeaderBar.pack_end] or [method@Gtk.HeaderBar.set_title_widget].