fix(shortcut): now user can increase the size of text using command

[ZAKIURREHMAN]

now user can increase the size of text using command +option +[, as well decrease. #14838

Summary by CodeRabbit

• New Features
  • Added keyboard shortcuts (Mod-Alt-[ and Mod-Alt-]) to increase or decrease paragraph heading levels quickly and efficiently.
  • Multi-selection support enables batch adjustments to heading levels across multiple selected blocks simultaneously.
  • Heading levels cycle seamlessly between text and h1–h6 heading styles, providing flexible formatting options.

[coderabbitai]

📝 Walkthrough

Walkthrough

NoteKeymap adds a new private helper _changeHeadingLevel that adjusts selected paragraph blocks' heading types (text, h1–h6) in either direction with wrapping. Two hotkeys (Mod-Alt-[ and Mod-Alt-]) register to trigger the helper and prevent default browser behavior.

Changes

Heading Level Adjustment

Layer / File(s)	Summary
Helper Implementation blocksuite/affine/blocks/note/src/note-keymap.ts	New private _changeHeadingLevel(direction) method filters selected blocks to eligible paragraphs, computes next heading type with wrapping (text ↔ h1–h6), and applies changes via single updateBlockType command.
Hotkey Wiring blocksuite/affine/blocks/note/src/note-keymap.ts	Two hotkeys (Mod-Alt-[ and Mod-Alt-]) registered to invoke _changeHeadingLevel with direction parameter and prevent default.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title mentions increasing text size via command, but the actual change adds heading level adjustment (text/h1-h6 cycling) via Mod-Alt-[ and Mod-Alt-], not text size changes.	Update the title to accurately reflect the feature: e.g., 'feat(shortcut): add keyboard shortcuts to change paragraph heading levels' or similar, to match the actual implementation.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@blocksuite/affine/blocks/note/src/note-keymap.ts`:
- Around line 250-257: The command currently applies a single props.type
(updates[0].nextType) to all selected blocks, overriding per-block computations;
change the payload so each selected block carries its own props with its
computed nextType. Specifically, replace the single props field and simple
selectedBlocks array with a selectedBlocks array of objects like {
blockComponent: u.blockComponent, props: { type: u.nextType } } (constructed
from updates.map(...)) when calling
this._std.command.chain().pipe(updateBlockType, ...), so updateBlockType
receives per-block props instead of a global props.

🪄 Autofix (Beta)

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: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5921c5dc-9f72-410d-80d3-25848a62cbd6

📥 Commits

Reviewing files that changed from the base of the PR and between 5813e7d and c750d82.

📒 Files selected for processing (1)

• blocksuite/affine/blocks/note/src/note-keymap.ts