Removes a child widget from @box.
The child must have been added before with [method@Gtk.Box.append], [method@Gtk.Box.prepend], or [method@Gtk.Box.insert_child_after].
the child to remove
See Implementation
Removes a child widget from @box.
The child must have been added before with [method@Gtk.Box.append], [method@Gtk.Box.prepend], or [method@Gtk.Box.insert_child_after].