PHP backports for WP 6.9

[ellatrix]

• Attachments REST API: Add support for filtering attachments by multiple media types wordpress-develop#10054
  • Fix adding blocks through media tab with experimental modal. #73029
• Add block visibility support wordpress-develop#10110
  • Block API: Add block visibility control support and UI #71203
• Backport new entity block binding binding wordpress-develop#10141
  • Navigation Link: Use block bindings to dynamically fetch the URL in the editor and on front end.  #71630
• Block editor: Conditionally enqueue front end assets for fitText. wordpress-develop#10190
  • Add: Fit text/stretch text block supports and variation. #71904
• HTML API: Backport from Gutenberg of layout image container refactor. wordpress-develop#10218
  • HTML API: Refactor layout image container. #72264
• Incorporating foundation of "Notes" feature wordpress-develop#10280
  • Notes: Graduate from experiments #72344
  • Notes: Don't change 'type' schema #72357
• Block Bindings: Use field instead of key in post-data source. wordpress-develop#10304
  • Block Bindings: Migrate post-data and term-data source to use field instead of key args. #72382
• Block Bindings: Update core/post-data source to work with Navigation blocks wordpress-develop#10305
  • Remove core/entity binding in favour of post and term data bindings. Apply to Nav blocks. #72165
• Backport for Math block and format wordpress-develop#10307
  • Add math block and rich text format #72182
• Block Bindings: Add support for Navigation Link and Submenu's url attr wordpress-develop#10322
  • Block Bindings: Move support for Navigation blocks url attribute to correct place #72418
  • Block Bindings: Remove spurious attributes from supported-by-6.8 list #72442
• Interactivity API: First support for loadOnClientNavigation wordpress-develop#10357
  • Reuse wp_script_attributes filter for adding data-wp-router-options attribute to script module #72489
• Ensure comments REST controller returns note type children wordpress-develop#10420
  • Notes: Fix 'children' embedding via REST API #72561
• Command Palette: Add network admin check wordpress-develop#10422
  • Command Palette: Disable site editor navigation commands on Network Admin - Take 2 #72698
• Template activation: merge new GB changes for Beta 2 wordpress-develop#10425
  • Template activation: rename new endpoints #72700
  • Template activation: remove fake post type for registered templates #72674
  • Template activation: remove the ability to deactivate registered templates #72636
  • Template activation: fix undefined array key PHP warning #72729
• Template activation: sync changes for Beta 3 wordpress-develop#10432
  • Template activation: inserting template through /templates should always result in active template #72770
  • Template activation: skip gutenberg_get_registered_block_templates query when no slugs are left to find #72795
• Fix: Don't load fit text front end scripts on the editor. wordpress-develop#10437
  • Fix: Don't load fit text front end scripts on the editor. #72842
• Command Palette: Decode HTML entities in menu url wordpress-develop#10446
  • Command Palette: Decode HTML entities in menu url #72898
• Block editor: [Backport] Make fit text work with the interativity API. wordpress-develop#10455
  • Fix: Make fit text work with the interativity API. #72923
• Theme JSON: Fix handling of default presets at block level wordpress-develop#10460
  • Theme JSON: Fix handling of default presets at block level #72916
• Fix: Custom font size taking over fit text. wordpress-develop#10517
  • Fix: Custom font size taking over fit text. #73241
• Block Support: Change block visibility support key wordpress-develop#10530
  • Block Support: Change block visibility support key #73432
• Block supports: Avoid warning for non string class attributes wordpress-develop#5486
  • Backport: Avoid warning for non-string class attributes. #71594
• Backport: Allow template duplication + concept of active templates wordpress-develop#8063
  • Allow template duplication + concept of active templates #67125
  • Template activation: call get_block_templates filter when short-circuiting #71840
  • Template activation: add meta to all newly created templates #72156
  • Template activation: don't set site option on edit #71811
  • Template activation: ignore templates not associated with active theme #72029
  • Template activation: fix /lookup endpoint to use custom resolve fn #72049
  • Template activation: allow empty array to be set #72011
  • Template activation: fix theme field for old REST API endpoint #72366
  • Template activation: reduce templates listed as options for post/page #72141
  • Template activation: improve back compat #72223
  • Template activation: duplicate modal on static template click, remove auto-drafting #72285
• REST API: Add export rel link for active theme response wordpress-develop#8770
  • Site Editor: Check user permissions before rendering export menu item #69971
• Backport: add support for selects on the elements API wordpress-develop#8961
  • Global styles: add support for select or dropdown elements #70379
• Fix ability to preview Additional CSS changes in the Customizer in Block Themes wordpress-develop#9000
  • Fix ability to preview Additional CSS changes in the Customizer when using a Block Theme #70428
• Backport: update theme.json to inherit button styles on frontend wordpress-develop#9268
  • Global Styles: Make Button element inherit all typography styles on the frontend #70676
• Block Bindings: Add post-data source, allow binding Date block's datetime attr wordpress-develop#9299
  • Date block: Allow connecting to Block Bindings #70585
  • Post Date block: Address feedback #70982
  • Date block: Move block_bindings_supported_attributes filter to compat layer #71662
• Add border radius preset settings to theme json and style engine wordpress-develop#9406
  • Themes: Support providing border radius presets #67544
• Block Bindings: Allow more generic setting of block attributes wordpress-develop#9469
  • Block Bindings: Add fallback for new features introduced in Core #71389
  • Block Bindings: Fix back-compat layer #71691
• Command Palette: Enqueue command-related assets for all admin pages wordpress-develop#9542
  • Command Palette: Enqueue assets globally #71264
  • Command Palette: Register menu navigation based on Core Menu API #71476
• Backport: add support for text inputs on the elements API  wordpress-develop#9600
  • Global styles: add element support for text related inputs #70378
• Block Bindings: Add block_bindings_supported_attributes filter wordpress-develop#9891
  • Block Bindings: Add block_bindings_supported_attributes filter #71663
• Block Bindings: Add postType to context for Post Data source wordpress-develop#9933
  • Block Bindings: API to extend the UI to external sources. #71542
• Block Bindings: Support Image block's caption attribute wordpress-develop#9949
  • Image block: Save <figcaption> if caption attr is bound #71483
• Block Bindings: Communicate supported block attributes from server side wordpress-develop#9992
  • Block Bindings: Communicate supported block attributes from server side #71820

[t-hamano]

Now that 6.9 is successfully released to the world, let's close this issue 👍