Slate v2 Placeholder Delete Parity Sweep

Status

Paused by user request.

Goal

Sweep the placeholder/delete-to-empty regression class against legacy Slate so the user does not have to report each placeholder bug one by one.

Scope

• Active code repo: /Users/zbeyens/git/slate-v2.
• Legacy comparison repo: /Users/zbeyens/git/slate.
• Browser route family: /examples/* surfaces that use Editable placeholders.
• Primary class: placeholder visibility, placeholder children, overlay style, root height, and focus/caret state after:
  • initial empty render
  • type into empty editor
  • delete all text back to empty
  • repeat type/delete once where cheap

Non-Goals

• Do not fix unrelated selection, richtext, or markdown behavior unless the sweep proves it is the same placeholder/delete-to-empty class.
• Do not manually patch example files when the owner is slate-react.
• Do not claim parity from jsdom only. Browser proof is required.

Known Prior Fix

• EditableTextBlocks subscribes to placeholder-visible state.
• EditableText skips custom renderPlaceholder when no placeholder value is present.
• Existing proof: custom-placeholder restores placeholder children and root height after type/delete.

Plan

1. Inventory v2 and legacy examples that pass placeholder to Editable.
2. Start or reuse both dev servers.
3. Run a browser sweep that records initial empty, after type, and after delete-to-empty states for each route.
4. Classify differences:
   • same-class bug: placeholder missing, child missing, overlay wrong, root height wrong, or focus lost after delete-to-empty.
   • example-specific: route intentionally differs or is not editable in the same way.
   • out-of-scope: non-placeholder behavior.
5. Patch the smallest shared owner for same-class bugs.
6. Add package-level regression coverage for each owner-level gap.
7. Verify with focused tests, slate-react package gates, lint, and real browser sweep.

Evidence Log

• 2026-04-26: User requested a sweep review against legacy for the same placeholder regression class instead of reporting each bug one by one.
• 2026-04-26: Targeted browser sweep finished before interruption. User then asked to stop testing placeholder, so no further classification or patching is being pursued in this lane.

Changeset

Required if slate-react package behavior changes.