fix(runtime-core): add if

[ivanheral]

Hi.
I have problems with the generated html using vue 3 and jsx.

some html tags are not painted correctly.

Can you add the code of @ConradSollitt?

vuejs/jsx-vue2#141

Thanks.

[yyx990803]

This is the wrong fix. h only accepts 3 arguments. JSX implementations should generate code using createVNode.

[ivanheral]

Hi @yyx990803,

accepts more than 3 arguments when add Fragment.

I have an example using vue3 with htm with the problem.

[ivanheral]

@yyx990803,
Here you have a link with the example of the problem. I have to replace rc6 with the fix to see html correctly.
https://github.com/ivanheral/vue3_fix