Input current value sync

[ShadoySV]

Places input current value into last tag state before comparing it with new one

Fixes #233

Checklist:

• I have ran ./ci/run_stable_checks.sh
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works

[jstarry]

Thanks @ShadoySV! Could you please add a test for this?

I think this test is a decent reference to how it would be done:

yew/yew/src/virtual_dom/vtag.rs

Lines 1178 to 1194 in 4b0d3d2

	let ancestor = vtag;
	let elem = html! { <div class=("class-1", "class-2", "class-3")></div> };
	let mut vtag = if let VNode::VTag(vtag) = elem {
	vtag
	} else {
	panic!("should be vtag")
	};
	vtag.apply(&scope, &parent, None, Some(VNode::VTag(ancestor)));
	let expected = "class-1 class-2 class-3";
	assert_eq!(get_class_str(&vtag), expected);
	assert_eq!(
	vtag.reference
	.as_ref()
	.unwrap()
	.get_attribute("class")
	.unwrap(),

To run tests first follow: https://github.com/yewstack/yew/blob/master/CONTRIBUTING.md#web-tests and then run one of the commands here: https://github.com/yewstack/yew/blob/master/CONTRIBUTING.md#running-tests

[jstarry]

Thank you! I just fixed the merge conflict and will merge when CI passes 👍