Removes a widget from the action area of @info_bar.
The widget must have been put there by a call to [method@Gtk.InfoBar.add_action_widget] or [method@Gtk.InfoBar.add_button].
an action widget to remove
See Implementation
Removes a widget from the action area of @info_bar.
The widget must have been put there by a call to [method@Gtk.InfoBar.add_action_widget] or [method@Gtk.InfoBar.add_button].