fix: touch selection auto-scroll in every direction

[bajrangCoder]

No description provided.

[greptile-apps]

Greptile Summary

This PR enhances the touch selection auto-scroll feature by adding support for both horizontal and vertical scrolling during text selection drag operations. Previously, auto-scroll only worked vertically (up/down), which limited usability when selecting text in long lines without line wrapping.

Key Changes

• New getEdgeScrollDirections helper: Detects which edge(s) (left/right/top/bottom) should trigger scrolling based on pointer position
• Bidirectional scroll state: Replaced single direction field with separate scrollX and scrollY to track both axes
• Smart boundary detection: Added #getAutoScrollDelta method that calculates scroll deltas and prevents over-scrolling at content boundaries
• Line wrapping awareness: Automatically disables horizontal scrolling when line wrapping is enabled (via !this.#view.lineWrapping)
• Animation frame optimization: Recalculates scroll direction on each frame to handle diagonal movements smoothly

Implementation Quality

The implementation is well-structured with proper boundary checks, clear separation of concerns, and good test coverage. The refactoring maintains backward compatibility while extending functionality cleanly.

Confidence Score: 5/5

• This PR is safe to merge with no concerns
• The changes are well-tested, logically sound, and enhance existing functionality without breaking changes. The code includes proper boundary validation, respects editor configuration (line wrapping), and adds comprehensive test coverage for the new helper function.
• No files require special attention

Important Files Changed

Filename	Overview
src/cm/touchSelectionMenu.js	Upgraded auto-scroll from vertical-only to bidirectional (horizontal + vertical) with proper boundary checking and line-wrapping awareness
src/test/editor.tests.js	Added comprehensive test coverage for the new getEdgeScrollDirections helper function, testing all directional combinations

_{Last reviewed commit: 20e5a85}