Panning does not work in external window

[yangwooseong]

Describe the bug

Panning does not work in external window.

To Reproduce
Steps to reproduce the behavior:
You can reproduce in https://codesandbox.io/s/still-leaf-t3shu (which is originally posted in #93)

Expected behavior
Panning should work in external window.

Additional context
I have done some test in cloned repo in dev mode, and I noticed diff in https://github.com/BetterTyped/react-zoom-pan-pinch/pull/448/files may not be correct change.

react-zoom-pan-pinch/src/core/pan/panning.utils.ts

Lines 19 to 28 in a0dac69

	const targetIsShadowDom = "shadowRoot" in target && "composedPath" in event;
	const isWrapperChild = targetIsShadowDom
	? event.composedPath().some((el) => {
	if (!(el instanceof Element)) {
	return false;
	}
	return wrapperComponent?.contains(el);
	})
	: wrapperComponent?.contains(target);

1. in operation returns true regardless of shadowRoot even though the value is null so I think nullability has to be checked.
2. If it's on the shadowRoot or external window, instance of Element is always false because every environment has its own internal class.