src/vs/workbench/contrib/comments/browser/commentNode.ts/CommentNode/focus
class CommentNode:	focus() {
		this.domNode.focus();
		if (!this._clearTimeout) {
			this.domNode.classList.add('focus');
			this._clearTimeout = setTimeout(() => {
				this.domNode.classList.remove('focus');
			}, 3000);
		}
	}