Gutenberg: 9.9 upgrade

[WunderBart]

Previous upgrade: #48950
Release notes: v9.9.0, v9.9.1, v9.9.2, v9.9.3

Process

• Install and activate
  • Copy & install v9.9.0-rc.1 (D56279-code, D56280-code)
  • Activate v9.9.0-rc.1 on edge (D56283-code)
  • Copy & install v9.9.0 (D56546-code, D56548-code)
  • Activate v9.9.0 on edge (D56547-code)
  • Copy & install v9.9.1 (D56650-code, D56651-code)
  • Activate v9.9.1 on edge (D56653-code)
  • Copy and install v9.9.2
  • Activate v9.9.2 on edge
  • Activate v9.9.2 on production (D56300-code)
  • Request v9.9.2 update for Atomic sites (p9o2xV-1g2-p2)
  • Copy and install v9.9.3
  • Activate v9.9.3 on edge (D57075-code)
  • Activate v9.9.3 on production (D57089-code)
  • Request v9.9.3 update for Atomic sites (p9o2xV-1gh-p2)
• Testing
  • Calypso E2E (Gutenberg: Trigger E2E suite for v9.9.x upgrade #49599 (comment))
  • Team City (D56300-code)
  • Calypso E2E against v9.9.3 (Gutenberg: Update the E2E suite to run correctly against v9.9.3 #50092)
  • Team City against v9.9.3 (D57089-code)
• Publish internal announcements (p7DVsv-auF-p2, p1613147997272200-slack-CB0B2G43X)
• Clean up unused releases
  • 9.5.2 (D56987-code)
  • 9.6.2 (D56990-code)
  • 9.7.0 (D56572-code)
  • 9.7.1 (D56584-code)
  • v9.7.2 (D56988-code)
  • v9.7.3 (D56989-code)
  • v9.7.4 (D56991-code)
  • v9.8.0-rc.1 (D56993-code)
  • v9.8.1 (D56994-code)
  • v9.8.2 (D56995-code)
  • v9.8.3 (D56997-code)
  • v9.9.0 (D57000-code)
  • v9.9.0-rc.1 (D57001-code)
  • v9.9.1 (D57002-code)
  • v9.9.2 (D57142-code)
• Update the Gutenberg Upgrade Log [pcoGjb-u-p2] and list patches applied (pcoGjb-K-p2)
• Open a new issue for the next upgrade, transfer remaining tasks, close this issue.

Issues / Blockers 🐛

Cover block's align regression issue [FIXED in v9.9.2]

• Reported in: New onboarding: Cover blocks aren't full width in Editor of created site #49673
• Breaks some of our templates (p1612384721081900-slack-C013QHLF28Y)
• WPCOM hotfix: r220611-wpcom
• Upstream fix: Cover: Add missing align attr to deprecation WordPress/gutenberg#28796

Previously-focused block stealing focus from newly-created block [FIXED in v9.9.3]

• Found through the GB Calypso E2E tests.
• Reported here: Previously-focused block steals focus from blocks added by the main inserter  WordPress/gutenberg#28932
• Possibly not a blocker.
• Upstream fix: Previously-focused block steals focus from blocks added by the main inserter  WordPress/gutenberg#28932

Gallery captions cannot be added or edited [FIXED in v9.9.3]

• Reported in: Gallery captions cannot be added or edited (plugin only) WordPress/gutenberg#28989
• Context: p1613295384091800-slack-CBTN58FTJ
• WPCOM hotfix: D57065-code
• Upstream fix: Add z-index to gallery fig caption to make sure it is still selectable over absolute positioned border WordPress/gutenberg#28992 (planned for v10.0)

Image editing unstable on Simple sites [FIXED]

• Fix: D56687-code
• See comments in the CfT post: p7DVsv-arm-p2
• Does this block us from upgrading production to 9.9.x? We can activate image editing independently.

Related tasks

• Enable image editing in WPCOM (pc9Uba-fo-p2)
  • Make sure Alow setting the crossOrigin attribute for the image transform's image using a filter WordPress/gutenberg#28255 is included in v9.9.0
  • Prepare CORS headers (D46175-code)
  • Setup the media.crossOrigin hook (D55980-code)
  • Open a CfT on edge sites (p7DVsv-arm-p2)
  • Remove the code that currently disables image editing in WPCOM (D56491-code)
• Rollback extraneous kses fix (D56582-code)

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FYI: @Automattic/good-mountain @tyxla @flootr @sarayourfriend @griffbrad @inaikem

[fullofcaffeine]

This is done 🎉. Next one: #50060.