Add new FrameLocator.waitForFunction() method

[ajssd]

Today we have contentFrame.waitForFunction() but this does not work with Frame Locators. What we would LIKE to do is this:

await locator.frameLocator('#my-frame').waitForFunction(() => { ... });

but what we have to do today is this:

const myFrame = await this.page.waitForSelector('#my-frame');
const myContentFrame = await myFrame.contentFrame();
await myContentFrame.waitForFunction(() => { ... });

Not the end of the world, but it's three async calls, and it takes away from a purely Locator-based approach that Playwright recommends.

Even something like this would get us halfway there:

const myContentFrame = await locator.frameLocator('#my-frame').contentFrame();
await myContentFrame.waitForFunction(() => { ... });

but there is no way to get the content frame from a frameLocator.

References:

• https://playwright.dev/docs/api/class-framelocator
• https://playwright.dev/docs/api/class-frame#frame-wait-for-function

[pavelfeldman]

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