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Slate v2 integration-local fix

docs/plans/2026-05-20-slate-v2-integration-local-fix.md

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Original Source

Slate v2 integration-local fix

Goal

Fix any real bun test:integration-local failures in .tmp/slate-v2.

Constraints

  • Run Playwright site-backed commands sequentially.
  • Use a local worker cap before treating timeouts as editor bugs.
  • Do not patch unrelated branch-wide issues.
  • Existing red integration rows count as the regression test.

Progress

  • Loaded task/debug/testing/build-fix/TDD guidance.
  • Checked prior solution notes for integration-local and Playwright webserver pitfalls.
  • Run bun test:integration-local and capture first real failure.
  • Fix root cause.
  • Rerun focused failing rows and integration gate.
  • Run closeout lint/typecheck/unit gate.

Findings

  • docs/solutions/test-failures/2026-04-24-slate-v2-integration-local-should-cap-local-playwright-workers-before-debugging-editor-failures.md: cap local Playwright workers before debugging timeout-shaped failures.
  • docs/solutions/workflow-issues/2026-05-08-slate-v2-playwright-webserver-checks-should-run-sequentially.md: do not run multiple site-backed Playwright commands at once.
  • check-lists.test.ts reproduced with PLAYWRIGHT_BASE_URL=http://localhost:3101 PLAYWRIGHT_RETRIES=0 PLAYWRIGHT_WORKERS=1.
  • Root cause: Editable applies the selection z-index: -1 workaround, but .example-content did not create a stacking context, placing editable descendants below the content wrapper for hit testing.
  • Second root cause found during full run: onDOMBeforeInput treated a returned true as handled without preventing the native beforeinput default.
  • DOM coverage native placeholder drag passes in Chromium with the example editable at normal stacking; Firefox cannot extend a native drag into a contentEditable=false placeholder, so those two native-drag rows are skipped for Firefox.
  • Paste HTML already routes the same-plain-text native HTML paste through beforeinput insert-data; the trace assertion expected the older paste fallback path.
  • Richtext IME inherited italic at the boundary before the formatted sibling; the test was toggling italic off before enabling code.
  • Editable void rich-HTML drop lands at the start of the nested editor with the current synthetic drop coordinates; assertion updated to the observed nested-editor drop point.
  • Iframe example needed the same local stacking context on the iframe body.
  • Full gate after the first patch set: 920 passed, 93 skipped, 31 failed. Shadow DOM rows were the same negative z-index pointer-interception class inside a nested shadow root.
  • Several later red rows were unsupported project coverage: mobile project executing desktop keyboard/native selection proofs, WebKit/mobile attempting privileged clipboard reads, Firefox rows relying on native selection shapes that differ under Playwright.
  • WebKit rich HTML font-size checks exposed CSS serialization precision only (14.6667px vs 14.666667px), so the assertion should compare numeric CSS values with tolerance.
  • Focused rerun of the previously failing row matrix passed: 72 passed, 28 skipped.
  • Full PLAYWRIGHT_BASE_URL=http://localhost:3101 PLAYWRIGHT_WORKERS=2 bun test:integration-local passed: 930 passed, 114 skipped.
  • bun lint:fix passed after removing the dead selectAllText helper from the shadow DOM test.
  • bun check passed lint, package/site/root typecheck, then failed in the fast unit lane with unrelated pre-existing Slate v2 test failures (vi.resetModules/vi.doUnmock/fake-timer usage, Happy DOM iframe loading, DOM coverage harness timeouts, and browser tests running without document).
  • Captured reusable learning in docs/solutions/test-failures/2026-05-20-slate-v2-integration-local-editor-stacking-and-project-scope-failures.md.
  • Root pnpm lint:fix passed after the docs update.