fix: RichEditor: Can't remove empty quote placed at start of document

[katsyuta]

Closes #82

Changes:

• Added tests
• Fixed deleting quotes

Summary by CodeRabbit

• New Features

  • Improved blockquote editing in the rich-text editor.
  • Backspace at the start of a quote now removes empty quotes or reduces nested quote levels while preserving text.

• Bug Fixes

  • Prevented unexpected quote formatting when deleting content at quote boundaries.

• Tests

  • Added coverage for creating, deleting, and nesting blockquotes.

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Run ID: 199f8fb0-4be4-41e7-bbf9-70dd1a98d101

📝 Walkthrough

Walkthrough

The rich editor now handles Backspace at the start of blockquotes. Empty quotes are removed, non-empty quotes are unwrapped, and nested quote levels are reduced incrementally. DOM tests cover these behaviors.

Changes

Blockquote Backspace Behavior

Layer / File(s)	Summary
Quote Backspace command packages/app/src/features/NoteEditor/RichEditor/plugins/KeyboardControlsPlugin/KeyboardControlsPlugin.ts	The keyboard plugin handles collapsed Backspace selections at the start of quote lines. It removes empty quotes or moves non-empty quote content into the parent.
Blockquote DOM coverage packages/app/src/features/NoteEditor/RichEditor/__tests__/spec/blockquote.dom.test.ts, packages/app/scripts/vitest.setup.ts	DOM tests cover quote creation, quote removal, nested quote reduction, text preservation, and selection setup. The test environment mocks Selection.prototype.modify.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🟡 Moderate · up to b991b

The keyboard handling change still fails when the cursor is in the first line of a multi-line quote, so the quote cannot be removed in that case. This bounded correctness issue should be fixed before merge.

Possibly related PRs

• DeepinkApp/deepink#308: Related RichEditor DOM testing infrastructure and blockquote behavior coverage.
• DeepinkApp/deepink#347: Related changes in KeyboardControlsPlugin.ts.

Suggested reviewers: vitonsky

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The Backspace handler and blockquote tests address the linked issue objective of removing an empty quote at the document start [#82].
Out of Scope Changes check	✅ Passed	The changes support the quote deletion fix through focused editor logic, DOM tests, and required test-environment setup.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main fix for removing an empty quote at the start of the document.

✨ Finishing Touches

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• Create PR with unit tests

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[katsyuta]

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Full review finished.

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Actionable comments posted: 1

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Inline comments:
In
`@packages/app/src/features/NoteEditor/RichEditor/plugins/KeyboardControlsPlugin/KeyboardControlsPlugin.ts`:
- Around line 110-121: The quote lookup in the backspace handler currently
relies on $getParentOfTextOnEnd, which fails for cursors in the first line of a
multi-line quote. Find the nearest quote ancestor from
selection.anchor.getNode(), retain the existing direct-first-child cursorLine
check, and add a DOM regression test covering backspace at offset zero in the
first line of a multi-line quote.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 632fbfb1-e045-4ff3-ac2b-3d6b476ca0f8

📥 Commits

Reviewing files that changed from the base of the PR and between 2efb7ed and b991ba5.

📒 Files selected for processing (3)

• packages/app/scripts/vitest.setup.ts
• packages/app/src/features/NoteEditor/RichEditor/__tests__/spec/blockquote.dom.test.ts
• packages/app/src/features/NoteEditor/RichEditor/plugins/KeyboardControlsPlugin/KeyboardControlsPlugin.ts