isDOM doesn't work on elements outside of current window

[yourWaifu]

This code

util/src/Dom/findDOMNode.ts

Lines 3 to 7 in 2880228

	export function isDOM(node: any): node is HTMLElement | SVGElement {
	// https://developer.mozilla.org/en-US/docs/Web/API/Element
	// Since XULElement is also subclass of Element, we only need HTMLElement and SVGElement
	return node instanceof HTMLElement || node instanceof SVGElement;
	}

Fails when node is not inside the current window. The main use case is using one screen for presentation and another screen for information that the presenter see.

an idea of a fix:

const nodeWindow = node?.ownerDocument?.defaultView;
return node instanceof nodeWindow.HTMLElement || node instanceof nodeWindow.SVGElement;

The issue is that the above code doesn't really work because you need to know if node is an Element first before getting the window, so we'll need a better idea for a fix.

a fix that I feel like is a hack:

return "nodeType" in node && node === Node.ELEMENT_NODE && "tagName" in node;

I don't know if this is good enough, but it works, fixes the bug.

same thing also happens here

util/src/Dom/isVisible.ts

Line 6 in 2880228

if (element instanceof Element) {

[yourWaifu]

I found this pull request contains fixes for this #639