Function match_widget 

pub fn match_widget(
    child: impl IntoUiNode,
    closure: impl FnMut(&mut MatchWidgetChild, UiNodeOp<'_>) + Send + 'static,
) -> UiNode

Creates a widget that is implemented as a closure that matches over UiNodeOp and delegates to another child widget.

The returned node will delegate to child like match_node does, and will also delegate UiNode::as_widget.

Note that the closure itself will not run inside WidgetUiNode::with_context.