setCurrentObject
Sets the current object for the @builder.
The current object can be thought of as the this
object that the builder is working for and will often be used as the default object when an object is optional.
method@Gtk.Widget.init_template for example will set the current object to the widget the template is inited for. For functions like ctor@Gtk.Builder.new_from_resource, the current object will be null.
Parameters
currentObject
the new current object