Fix: Assertion Failure in line.dart When Editing Text with Block-Level Attributes

[AtlasAutocode]

Description

Editing text with block attributes failed to show text until cursor moved. Assertion failure indicated that block level attributes were being applied to inline text whereas they should only be applied to line endings. The assert failure prevented code from updating the display. However, the root cause was in the QuillController replaceText function which incorrectly retained block attributes.

Related Issues

• Fix Assertion Failure in line.dart When Editing Text with Block-Level Attributes in Debug Mode #2150
• Fix The following assertion was thrown during method call TextInputClient.updateEditingState #1622

Type of Change

• ✨ New feature: Adds new functionality without breaking existing features.
• [ X ] 🛠️ 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.