Expiriments with AvaloniaEdit and tracking document changes

.ai-guidelines.md

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+# pgLabII AI Assistant Guidelines
+
+## Project Context
+This is a .NET 8/C# 13 Avalonia cross-platform application for document management.
+
+### Architecture Overview
+- **Main Project**: pgLabII (Avalonia UI)
+- **Platform Projects**: pgLabII.Desktop
+- **Utility Project**: pgLabII.PgUtils
+- **Core Components**: DocumentSession, DocumentSessionFactory, LocalDb
+
+## Coding Standards
+
+### C# Guidelines
+- Use C# 13 features and modern .NET patterns
+- Prefer primary constructors for dependency injection
+- Use `var` for obvious types, explicit types for clarity
+- Implement proper async/await patterns for I/O operations
+- Use nullable reference types consistently
+- Prefer "target-typed new"
+- Prefer "list initializer" over new
+
+### Avalonia-Specific
+- Follow MVVM pattern strictly
+- ViewModels should inherit from appropriate base classes
+- Use ReactiveUI patterns where applicable
+- Make use of annotations to generate bindable properties
+- Implement proper data binding
+- Consider cross-platform UI constraints
+
+### Project Patterns
+- Services should use dependency injection
+- Use the DocumentSession pattern for data operations
+- Integrate with LocalDb for persistence
+- Implement proper error handling and logging
+- Consider performance for document operations
+- Use FluentResults.Result for expected errors
+
+### Architecture Rules
+- Keep platform-specific code in respective platform projects
+- Shared business logic in main pgLabII project
+- Utilities in pgLabII.PgUtils
+- Follow clean architecture principles
+
+## Code Review Focus Areas
+1. Memory management for document operations
+2. Cross-platform compatibility
+3. Proper async patterns
+4. Error handling and user feedback
+5. Performance considerations for large documents
+6. UI responsiveness