[Regression]: Tests fails in parallel run when click on dropdown options performed about playwright

[yury-s]

сс @aslushnikov

[aslushnikov]

Indeed I can easily repro!

Turns out Juggler's focused page emulation is faulty and lets tabs to blur.

The reproduction:

import { firefox } from '@playwright/test';

const browser = await firefox.launch({
  executablePath: process.env.FFPATH,
  headless: false
});

async function run(id, page) {
  console.log('start', id);
  for (let i = 0; i < 10; i++) {
    await page.locator('.multiselect__select').click();
    await page.locator('li.multiselect__element').filter({ hasText: 'Option 3' }).click();
  }
  console.log('done', id);
}

const page1 = await browser.newPage();
await page1.goto('https://ilia-krivonosov.github.io/dropdown/');
const page2 = await browser.newPage();
await page2.goto('https://ilia-krivonosov.github.io/dropdown/');

await Promise.all([
  run('page1', page1),
  run('page2', page2),
]);
await browser.close();