src/vs/workbench/contrib/welcomeWalkthrough/browser/walkThroughPart.ts/WalkThroughPart/focus
class WalkThroughPart:	override focus(): void {
		let active = document.activeElement;
		while (active && active !== this.content) {
			active = active.parentElement;
		}
		if (!active) {
			(this.lastFocus || this.content).focus();
		}
		this.editorFocus.set(true);
	}