Allow backspace at start of document to remove block style and header style

[agata]

Description

This is a fix for #2180. It adjusts behavior so that pressing backspace at the beginning of a document when the cursor is on a header/block will remove the header/block style. This allows styles to be removed using only keyboard operations, without needing to use the toolbar, thereby improving convenience.

2024-09-10.2.01.55.mp4

This pull request will slightly modify existing behavior.

Related Issues

• Fix Unable to Delete Heading 1 at the Beginning of a Line with Backspace #2180

Type of Change

• ✨ New feature: Adds new functionality without breaking existing features.
• 🛠️ Bug fix: Resolves an issue without altering current behavior.
• 🧹 Code refactor: Code restructuring that does not affect behavior.
• ❌ Breaking change: Alters existing functionality and requires updates.
• 🧪 Tests: Adds new tests or modifies existing tests.
• 📝 Documentation: Updates or additions to documentation.
• 🗑️ Chore: Routine tasks, or maintenance.
• ✅ Build configuration change: Changes to build or deploy processes.

Suggestions

[CatHood0]

Do you test these changes if the document is more than 1 line?

[singerdmx]

@agata can you confirm you test these changes that the document is more than 1 line

[agata]

@singerdmx @CatHood0

Could you please clarify whether you are referring to automated tests, such as unit tests, or to manual testing when you mention 'test' in this context?

In manual operation tests, it functions correctly even in documents containing multiple lines. Please see the screencast here.

2024-09-10.2.23.30.mp4