WordPress 6.4 compatibility

[jeherve]

WordPress 6.4 is set to release on November 7, 2023.

• Planning: make.wordpress.org/core/6-4
• PT: pf5801-82-p2

Let's use this issue to keep track of anything that may come up until then.

Tasks

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1. WordPress Compatibility: update our "tested up to" version to 6.4 #33525
   General [Pri] Normal [Type] Janitorial +3
   
2. Carousel: ensure that changes to attachment pages do not break Carousel #33643
   [Feature] Carousel [Plugin] Jetpack [Pri] Normal [Type] Janitorial +4
   
3. RichText: replace deprecated multiline prop with simple multiple instances (Donations block) #33642
   Earn [Block] Donations [Pri] Normal [Type] Janitorial +4
   
4. SSO / Protect: ensure that login page changes do not impact Jetpack features #33654
   [Feature] Protect [Feature] SSO [Plugin] Jetpack [Plugin] Protect [Pri] Normal [Type] Janitorial +6
   
5. Update deprecated inline style functions #33655
   [Boost Feature] Critical CSS [Plugin] Boost [Plugin] CRM [Pri] Normal [Type] Janitorial +5
   
6. Comments: Fix reply functionality in WP 6.4 RC #33709
   [Feature] Comments [Plugin] Jetpack [Pri] BLOCKER [Type] Bug +4
   
7. Twenty Twenty Four: ensure compatibility with Jetpack #33779
   [Focus] Compatibility [Pri] Normal [Type] Janitorial +3
   
8. Janitorial: handle deprecation of TEMPLATEPATH and STYLESHEETPATH #33874
   General [Feature] WPCOM API [Plugin] CRM [Pri] Normal [Type] Janitorial +5
   

And in a follow-up plugin release (most likely the December release, 12.9), to give folks time to update:

Tasks

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1. General: update WP version requirements to WordPress 6.3. #34127
   Actions [Plugin] Backup [Plugin] Inspect [Plugin] Jetpack [Plugin] Migration [Plugin] Protect [Plugin] Search [Plugin] Social [Plugin] Starter Plugin [Plugin] Super Cache [Plugin] VideoPress [Pri] Normal [Tools] Development CLI [Type] Janitorial +14
   
2. General: remove 6.2 backward-compatible checks #34209
   General [Pri] Normal [Type] Janitorial +3
   
3. Assets: switch to registering scripts with async and defer attributes introduced in WordPress 6.3 #32852
   General [Package] Assets [Pri] Low [Type] Janitorial +4
   
4. Layout updates: __experimentalLayout is now layout #32853
   [Focus] Blocks [Plugin] Jetpack [Pri] Normal [Type] Janitorial +4
   
5. Code modernization: Replace usage of strpos with str_starts_with #32854
   General [Pri] Low [Type] Janitorial +3
   
6. Code modernization: Replace usage of strpos with str_contains #32863
   General [Pri] Low [Type] Janitorial +3
   
7. Code modernization: Replace usage of substr with str_starts_with and str_ends_with #32864
   General [Pri] Low [Type] Janitorial +3
   
8. General: drop support for PHP 5 #31714
   General [Pri] Normal [Type] Janitorial +3
   
9. Form Block: prioritize inner blocks in the inserter #31716
   [Block] Contact Form [Feature] Contact Form [Package] Forms [Pri] Normal [Type] Enhancement +5
   
10. Coordinate deactivation of the Lazy Images feature in Jetpack in favor of Core's (see Lazy Images: deprecate functionality #33048)

In addition to the above, we can follow the dev-notes that will drop here about the release:
make.wordpress.org/core/tag/dev-notes+6-4

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For reference: prior art for WordPress 6.3 compat: #31638

[jeherve]

Marking this one as done; all tasks have now been handled.