src/vs/editor/browser/controller/mouseTarget.ts/MouseTargetFactory/_hitTestContentWidget
class MouseTargetFactory:	private static _hitTestContentWidget(ctx: HitTestContext, request: ResolvedHitTestRequest): IMouseTarget | null {
		// Is it a content widget?
		if (ElementPath.isChildOfContentWidgets(request.targetPath) || ElementPath.isChildOfOverflowingContentWidgets(request.targetPath)) {
			const widgetId = ctx.findAttribute(request.target, 'widgetId');
			if (widgetId) {
				return request.fulfillContentWidget(widgetId);
			} else {
				return request.fulfillUnknown();
			}
		}
		return null;
	}