[Bug] error when selecting text with mouse in shadow dom

[hungtcs]

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

Link To Monaco Playground

Monaco Editor Playground Code

const defaultValue = `async function main() {
  // select this text with the mouse and an error will appear in the console
}
main().catch((err) => console.error(err))
`;

class MyElement extends HTMLElement {
	constructor() {
		super();
		const shadowRoot = this.attachShadow({ mode: "open" });
		const styleLink = document.createElement('link');
		styleLink.rel ='stylesheet';
		styleLink.href = 'node_modules/monaco-editor/min/vs/editor/editor.main.css'
		shadowRoot.appendChild(styleLink);
	}

	connectedCallback() {
		const conatiner = document.createElement("div");
		conatiner.style.width ='100%'
		conatiner.style.height ='320px'
		conatiner.style.resize ='both'
		conatiner.style.overflow ='hidden'
		this.shadowRoot?.appendChild(conatiner);
		
		monaco.editor.create(conatiner, {
			value: defaultValue,
			theme: 'vs-dark',
			language: "javascript",
			automaticLayout: true,
		});
	}
}

customElements.define('my-element', MyElement);

Reproduction Steps

1. Select the text in editor with the mouse
2. An error will appear in the console

Actual (Problematic) Behavior

An error occurred in the console

Expected Behavior

No response

Additional Context

No response

[hungtcs]

The method can be traced through the stack

function shadowCaretRangeFromPoint(shadowRoot, x, y) {
    const range = document.createRange();
    // Get the element under the point
    let el = shadowRoot.elementFromPoint(x, y);
    if (el !== null) {
        // parameter 1 is not of type 'Node'.                       // <---
        range.setStart(el.firstChild, offset);
        range.setEnd(el.firstChild, offset);
    }
    return range;
}

[dominik1996]

We ran into the same issue: v0.47.0 is the last version to work correctly.