Fix left border updates for multi-row table selections

[zbeyens]

Check	Result
PR	#4922
Issue	#4798
Confidence	🟢 95%

Phase	🧪 Tests	🌐 Browser
Reproduced	🔴	⚠️ Could not automate dropdown
Verified	🟢	⚠️ Could not automate dropdown

🌐 Browser Check

• Open http://localhost:3000/docs/table.
• Select right-column cells across two rows.
• Toggle left border.
• Confirm both selected rows update, not just top row.
• Toggle back off. Confirm both rows clear.

✅ Outcome

• Fixed at the table-selection seam, not the border-command workaround.
• Path-targeted writes bypass the multi-cell override unless the target is selected.
• Adjacent-cell border writes update both selected rows.
• Includes task handoff rule updates.

⚠️ Caveat

• Real multi-cell selection verified.
• Could not automate the border dropdown reliably.

🏗️ Design

• Chosen seam: table cell selection override in withTableCellSelection.
• Why not quick patch: border command was one victim; caller workaround would rot.
• Why not broader change: seam fix solved path-targeted writes without widening public API.

🧪 Verified

• pnpm --filter @platejs/table test packages/table/src/lib/withTableCellSelection.spec.tsx packages/table/src/react/components/TableCellElement/setSelectedCellsBorder.integration.spec.tsx packages/table/src/react/components/TableCellElement/setSelectedCellsBorder.spec.tsx packages/table/src/lib/queries/getSelectedCellsBorders.spec.tsx
• pnpm install
• pnpm turbo build --filter=./packages/table
• pnpm turbo typecheck --filter=./packages/table
• pnpm lint:fix
• pnpm check

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Latest commit: 2c92ca4

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Project	Deployment	Actions	Updated (UTC)
plate	Ready	Preview, Comment	Mar 29, 2026 11:07pm