Improve edit scrolling

[hannesrudolph]

Description

Improves diff handling and streaming performance in the DiffViewProvider through two main changes:

1. Enhanced diff algorithm implementation:

   • Replaces simple line comparison with proper diff.diffLines() algorithm
   • Improves EOL character handling and content management
   • Adds detection and handling of auto-formatting changes
   • Better handles edge cases like HTML tag auto-closing

2. Optimized streaming performance:

   • Implements chunk-based content updates instead of line-by-line
   • Dynamic chunk sizing (max(50, totalLines/20)) for optimal performance
   • Adds 10ms delay between chunks for smooth visualization
   • Improves scroll behavior with smarter viewport management

Type of change

• New feature
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

The changes have been tested through:

• Manual verification of diff accuracy with various file types and content changes
• Performance testing with large files to validate chunk-based streaming
• Visual testing of streaming animation smoothness
• Validation of scroll behavior and viewport management

The changes have NOT been tested through:

• Edge case testing for EOL characters and auto-formatting scenarios

Checklist:

• [] My code follows the patterns of this project
• I have performed a self-review of my own code
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have made corresponding changes to the documentation

Additional context

This refactor significantly improves the performance and reliability of the diff view streaming functionality, particularly for large files. The chunk-based approach with dynamic sizing ensures smooth visualization while maintaining responsiveness.

Related Issues

Improves performance and reliability for #diff-streaming #large-files

Reviewers

@hannesrudolph

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Important

Enhances diff handling and streaming performance in DiffViewProvider.ts with improved diff algorithm and chunk-based updates.

• Diff Algorithm:
  • Replaces line comparison with diff.diffLines() in scrollToFirstDiff().
  • Handles EOL characters and auto-formatting in saveChanges().
• Streaming Performance:
  • Implements chunk-based updates in update() with dynamic sizing and 10ms delay.
  • Enhances scroll behavior in scrollEditorToLine() for smoother appearance.
• Misc:
  • Adds autoFormattingEdits to saveChanges() return value.
  • Adjusts scrollEditorToLine() to scroll only if needed.

^{This description was created by for 7e64a96. It will automatically update as commits are pushed.}

[mrubens]

Going to close this one for now in favor of #595. Thank you!