Emoji detection not working in the latest Chrome on Windows 7

[SergeyBiryukov]

Reported by @Webliberty on Russian WP Slack.

1. Create a post with this content: :) ;).
2. View the post in the latest Chrome (version 87.0.4280.141 as of writing) on Windows 7.
3. Instead of regular colored images, you'll see one blank square and one monochrome icon.

If the platform does not support the current emoji set natively, the Twemoji fallback is supposed to replace it with images, but does not kick in as expected.

Some history here:

• [46665] / #48293 updated Twemoji to 12.1.3 for WordPress 5.3.
• [48048] / #50148 updated Twemoji to 13.0.0 for WordPress 5.5.
• [49239] / #51356 updated Twemoji to 13.0.1 for WordPress 5.6.

Upon some testing, this used to work in WordPress 5.4 and no longer works in WordPress 5.5, so appears to be a regression in [48048].

Reverting the changes to js/_enqueues/lib/emoji-loader.js from [48048], as well as the corresponding ​minified fragment in _print_emoji_detection_script() to ​the one from WordPress 5.4 makes the images display again.

Since extended support for Windows 7 ​has ended a year ago on January 14, 2020, this may very well be an edge case. This ticket was created for reference just in case it might still be worth fixing.

[SergeyBiryukov]

Related: #46404

[desrosj]

Since Windows 7 has now been unsupported for almost 3 years, thinking this can probably be closed out.

@SergeyBiryukov are you able to reproduce this today in a way that makes you feel this should remain open for further investigation?

[kraftbj]

I'm going to close this, but can be reopened if deemed important to investigate.