WP 6.3 Compatibility: Fix the errors of "setImmediate is not defined"

[eason9487]

Changes proposed in this Pull Request:

Closes #2040

WordPress 6.3 will remove setImmediate, so the following errors were found while testing with WP 6.3-rc3.

Ref:

• Polyfills: exclude web.immediate
• WP 6.3 includes the exclusion

To fix it, this PR:

• Replace the deprecated setImmediate with setTimeout.
• Added test cases about compatibility to AdaptiveForm component.

Screenshots:

Kapture.2023-08-03.at.16.37.51.mp4

Detailed test instructions:

WP 6.3 is not yet released. One of the ways to test this PR with a RC version is using WP-CLI:

wp core update --version=6.3-RC3

AdaptiveForm

1. Go to the onboarding flow or the Edit Free Listings page.
2. On the shipping section, select some audience countries and set up shipping config.
3. Remove one of the audience countries.
4. Check if the shipping config of the removed country is removed as well.

useCroppedImageSelector

Refer to the test instructions in #1906.

Changelog entry

Fix - WordPress 6.3 compatibility: The forms and image selector may not work due to "setImmediate" deprecation.

[martynmjones]

Hey @eason9487, thanks for the quick fix 🙌

Tested locally and confirmed that:

• Error is no longer triggered during onboarding
• Image crop selection is working correctly
• No references left to setImmediate in the code
• Tests are passing

So LGTM ✅