conditional 'if' doesn't work with ChildrenRenderer<T>

[ctron]

Problem

When using ChildrenRenderer<T> (instead of Children), then the conditional if doesn't seem to work.

Steps To Reproduce

#[function_component(Bar)]
fn bar() -> Html { html!() }

#[derive(PartialEq, Properties)]
struct FooProperties {
    pub childern: ChildrenRenderer<Bar>,
}

#[function_component(Foo)]
fn foo(props: &FooProperties) -> Html {}

#[function_component(Example)]
fn example() -> Html {
  let some_switch = false;
  html!(
    <Foo>
        <Bar/>
        if some_switch {
            <Bar/>
        }
        <Bar/>
    </Foo>
  )
}

Expected behavior

I would expect this to work the same way as with Children.

Environment:

• Yew version: 0.20.0
• Rust version: 1.67.1
• Target, if relevant: wasm32-unknown-unknown
• Build tool, if relevant: trunk

Questionnaire

• [x] I'm interested in fixing this myself but don't know where to start
• [ ] I would like to fix and I have a solution
• [ ] I don't have time to fix this right now, but maybe later

[ctron]

It looks like a possible workaround is to use:

#[function_component(Example)]
fn example() -> Html {
  let some_switch = false;
  html!(
    <Foo>
        <Bar/>
        { if some_switch {
            Some(html_nested!(<Bar/>))
        } else { None } }
        <Bar/>
    </Foo>
  )
}

[ranile]

The issue is discussed more in depth in #3256. Please continue the discussion there