fix(editor): preserve first-click caret in WKWebView

[murongg]

Opening a long note and clicking below the fold for the first time can scroll macOS WKWebView back to the top and create a large selection. WKWebView omits the Version/ user-agent token, so CodeMirror detects Safari version 0 and skips its Safari 26+ workaround for broken focus({ preventScroll: true }) support. The scroll reset changes the document position between the two hit tests for the same click.

Apply a pnpm patch to @codemirror/view@6.41.1 that includes unknown Safari versions in the existing scroll-restoration fallback. Both ESM and CommonJS entry points are patched, and the same dependency serves the visual and source editors. Add regression coverage for initial focus and refocus, including nested vertical and horizontal scroll positions, and document when to remove the patch.

Closes #736.

Validation

• Regression tests failed before the patch with scroll position 0 instead of 1600, then passed for both module entry points.
• corepack pnpm --filter @markra/editor test — 596 tests passed.
• corepack pnpm --filter @markra/app test src/components/CodeMirrorPaperSurface.test.tsx src/components/MarkdownSourceEditor.test.tsx src/hooks/useCodeMirrorEditorController.test.tsx — 67 tests passed.
• corepack pnpm --filter @markra/editor-react test — 6 tests passed.
• corepack pnpm --filter @markra/editor typecheck:test — passed.
• corepack pnpm install --frozen-lockfile --ignore-scripts — passed.
• corepack pnpm build — passed, including web and desktop frontend builds and vendor-chunk validation.
• Playwright component QA using synthetic long notes: 30 checks passed across WebKit with WKWebView UA, Safari UA, and Chromium, in both visual and source modes. First clicks at three scroll positions preserve the caret and scroll offset; drag selection and Shift-click after blur remain functional; Markdown stays unchanged. The unpatched WKWebView-UA reproduction failed at all three scroll positions.

Browser QA used the actual editor components after fonts and layout settled. The system WKWebView UA was independently confirmed with a native WebKit probe; the packaged Tauri app was not exercised.

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Project	Deployment	Actions	Updated
markra-web	Ready	Preview	Sep 19, 2026 12:38am UTC