[Feature] Pass Locator into page.waitForFunction to wait custom condition

Provide possible to pass Locator into page.waitForFunction function to wait custom condition on page Example: await page.waitForFunction(async (loc: Locator) => { return await loc.isVisible() === false }, locator, { timeout: this.timeout })

In general it possible replace eval/evaluate functionality and be more clear for people who migrate from other frameworks and programming languages.

For example simple way to understand released in WDIO7 https://webdriver.io/docs/api/browser/waitUntil

[AndreyMelnichenko]

@dgozman How about create something more generate methods? Like await page.waitUntil(function(), options) and waitUntil will wait function return true, and pool it each timeout from options object Does it make sense? Full example: await page.waitUntil(async(el) => { return await locator.innerText() === 'Apply button'}, {pool: 100})

[pavelfeldman]

Playwright v1.21 will have this: https://playwright.dev/docs/next/test-assertions#polling