Suggest mode 5/9: inline suggestion operations

[adamsilverstein]

Part of #73411

What's in this PR

Adds the suggestion-specific layer on top of the marker primitive: create,
accept, and reject inline text (add/del) and formatting suggestions
(operations.js); the pure reconcilers that turn a text edit or a format
toggle into marker actions (reconcile-edit.js, reconcile-format.js); word/
line delete-range resolution; strip-markers for clean attribute snapshots;
findSuggestionText/findMarkerText helpers; and the annotate-suggestions hook.
Still pure modules - the keyboards and reconcilers that call them into the
live editor land in the final step.

Diagram

Pure transforms over a rich-text value: write a marker, resolve it on accept or reject, strip it for output.

Testing

This is one layer of the stack. To exercise the whole feature, #78994 bundles every layer into one branch and builds it in Playground:

👉 https://playground.wordpress.net/gutenberg.html?pr=78994

Enable Gutenberg > Experiments > Collaboration > Suggestion Mode, then follow the walkthrough in #73411, which also explains how to review the stack layer by layer.

---

Suggest mode stack

This rebuilds the manually-stacked Suggest mode work (#73411) as a GitHub Stack of 9 small, independently reviewable PRs, each building on the one below it:

1. #80427 - editor intent (edit/suggest/view) + experiment gate
2. #80428 - suggestion storage, REST controller, provider
3. #80429 - block-level capture (attribute + structural)
4. #80430 - inline marker primitive
5. #80431 - inline suggestion operations
6. #80432 - review UI (Apply/Reject sidebar + summary)
7. #80433 - inline live wiring
8. #82047 - architecture documentation
9. #82048 - end-to-end test suite

Each follow up fix now sits in the layer that owns the code it changes, rather than piling onto the top of the stack. The whole feature can be exercised end-to-end via the combined testing branch #78994 (Playground). Behind the "Suggestion Mode" experiment (Gutenberg > Experiments).

---

AI Use

Code and description both written with 🤖 Claude Code. I will review and test.

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Size Change: 0 B

Total Size: 7.93 MB

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Co-authored-by: adamsilverstein <adamsilverstein@git.wordpress.org>

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[github-actions]

Flaky tests detected in d690668.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/33117688052
📝 Reported tests:

refuses the drop and uploads nothing in /test/e2e/specs/editor/various/single-file-placeholder-drop.spec.js, passed after 1 failed attempt.

Error: expect(received).toHaveLength(expected)

Expected length: 0
Received length: 2
Received array:  [{"_links": {"about": [{"href": "http://localhost:8889/wp-json/wp/v2/types/attachment"}], "author": [{"embeddable": true, "href": "http://localhost:8889/wp-json/wp/v2/users/1"}], "collection": [{"href": "http://localhost:8889/wp-json/wp/v2/media"}], "curies": [{"href": "https://api.w.org/{rel}", "name": "wp", "templated": true}], "replies": [{"embeddable": true, "href": "http://localhost:8889/wp-json/wp/v2/comments?post=106"}], "self": [{"href": "http://localhost:8889/wp-json/wp/v2/media/106", "targetHints": {"allow": ["GET", "POST", "PUT", "PATCH", "DELETE"]}}], "wp:attached-to": [{"embeddable": true, "href": "http://localhost:8889/wp-json/wp/v2/posts/104", "id": 104, "post_type": "post"}]}, "alt_text": "", "author": 1, "caption": {"rendered": ""}, "class_list": ["post-106", "attachment", "type-attachment", "status-inherit", "hentry", "entry"], "comment_status": "open", "date": "2026-08-27T21:35:42", "date_gmt": "2026-08-27T21:35:42", "description": {"rendered": "<p class=\"attachment\"><a href='http://localhost:8889/wp-content/uploads/2026/08/10x10_e2e_test_image_z9T8jK-1.png'><img loading=\"lazy\" decoding=\"async\" width=\"10\" height=\"10\" src=\"http://localhost:8889/wp-content/uploads/2026/08/10x10_e2e_test_image_z9T8jK-1.png\" class=\"attachment-medium size-medium\" alt=\"\" style=\"width:100%;height:100%;max-width:10px;\" /></a></p>
"}, "featured_media": 0, "filename": "10x10_e2e_test_image_z9T8jK-1.png", "filesize": 80, "guid": {"rendered": "http://localhost:8889/wp-content/uploads/2026/08/10x10_e2e_test_image_z9T8jK-1.png"}, "id": 106, "link": "http://localhost:8889/?attachment_id=106", "media_details": {"file": "2026/08/10x10_e2e_test_image_z9T8jK-1.png", "filesize": 80, "height": 10, "image_meta": {"alt": "", "aperture": "0", "camera": "", "caption": "", "copyright": "", "created_timestamp": "0", "credit": "", "focal_length": "0", "iso": "0", "keywords": [], "orientation": "0", "shutter_speed": "0", "title": ""}, "sizes": {}, "width": 10}, "media_type": "image", "meta": [], "mime_type": "image/png", "modified": "2026-08-27T21:35:42", "modified_gmt": "2026-08-27T21:35:42", "ping_status": "closed", "post": 104, "slug": "10x10_e2e_test_image_z9t8jk-2", "source_url": "http://localhost:8889/wp-content/uploads/2026/08/10x10_e2e_test_image_z9T8jK-1.png", "status": "inherit", "template": "", "title": {"rendered": "10x10_e2e_test_image_z9T8jK"}, "type": "attachment"}, {"_links": {"about": [{"href": "http://localhost:8889/wp-json/wp/v2/types/attachment"}], "author": [{"embeddable": true, "href": "http://localhost:8889/wp-json/wp/v2/users/1"}], "collection": [{"href": "http://localhost:8889/wp-json/wp/v2/media"}], "curies": [{"href": "https://api.w.org/{rel}", "name": "wp", "templated": true}], "replies": [{"embeddable": true, "href": "http://localhost:8889/wp-json/wp/v2/comments?post=105"}], "self": [{"href": "http://localhost:8889/wp-json/wp/v2/media/105", "targetHints": {"allow": ["GET", "POST", "PUT", "PATCH", "DELETE"]}}], "wp:attached-to": [{"embeddable": true, "href": "http://localhost:8889/wp-json/wp/v2/posts/104", "id": 104, "post_type": "post"}]}, "alt_text": "", "author": 1, "caption": {"rendered": ""}, "class_list": ["post-105", "attachment", "type-attachment", "status-inherit", "hentry", "entry"], "comment_status": "open", "date": "2026-08-27T21:35:42", "date_gmt": "2026-08-27T21:35:42", "description": {"rendered": "<p class=\"attachment\"><a href='http://localhost:8889/wp-content/uploads/2026/08/10x10_e2e_test_image_z9T8jK.png'><img loading=\"lazy\" decoding=\"async\" width=\"10\" height=\"10\" src=\"http://localhost:8889/wp-content/uploads/2026/08/10x10_e2e_test_image_z9T8jK.png\" class=\"attachment-medium size-medium\" alt=\"\" style=\"width:100%;height:100%;max-width:10px;\" /></a></p>
"}, "featured_media": 0, "filename": "10x10_e2e_test_image_z9T8jK.png", "filesize": 80, "guid": {"rendered": "http://localhost:8889/wp-content/uploads/2026/08/10x10_e2e_test_image_z9T8jK.png"}, "id": 105, "link": "http://localhost:8889/?attachment_id=105", "media_details": {"file": "2026/08/10x10_e2e_test_image_z9T8jK.png", "filesize": 80, "height": 10, "image_meta": {"alt": "", "aperture": "0", "camera": "", "caption": "", "copyright": "", "created_timestamp": "0", "credit": "", "focal_length": "0", "iso": "0", "keywords": [], "orientation": "0", "shutter_speed": "0", "title": ""}, "sizes": {}, "width": 10}, "media_type": "image", "meta": [], "mime_type": "image/png", "modified": "2026-08-27T21:35:42", "modified_gmt": "2026-08-27T21:35:42", "ping_status": "closed", "post": 104, "slug": "10x10_e2e_test_image_z9t8jk", "source_url": "http://localhost:8889/wp-content/uploads/2026/08/10x10_e2e_test_image_z9T8jK.png", "status": "inherit", "template": "", "title": {"rendered": "10x10_e2e_test_image_z9T8jK"}, "type": "attachment"}]
    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/various/single-file-placeholder-drop.spec.js:71:45

[adamsilverstein]

Claude reproduced this one first, then fixed it:

Fixed in a8f4487. unwrapMarker() stripped the suggestion format across the whole first-to-last-fragment range, so a different suggestion in the gap was resolved too. It now unwraps only the runs carrying the resolved id, using the same run walk removeMarkedRange() already relied on (now a shared runsCarryingId() helper). New tests cover add#1 A / add#2 B / add#1 C for accepting the addition and the matching deletion reject. Both failed before the change.