Context

Fixes a bug where project symbol search navigates to the wrong position when diff hunks are expanded. The cursor would land offset by the number of lines added by the expanded diffs (Closes #51331). Now, users navigating to symbols via project symbol search will land on the correct position even when diff hunks are expanded in the editor.

The fix converts the buffer position to a multi_buffer::Anchor before passing it to select_ranges, so it resolves correctly through the diff transform layer instead of being interpreted as a literal MultiBuffer coordinate.

Previously, the symbol's position was passed as a raw coordinate to the editor, which interpreted it relative to what's displayed on screen (including expanded diff lines). The fix converts the position to an anchor, which is tied to the actual content in the file rather than a screen position.

How to Review

• All changes are in crates/project_symbols/src/project_symbols.rs. Most of the changes are in confirm() method (Lines 142-154).
  • There's also one change on the first line of the file.

Self-Review Checklist

• I've reviewed my own diff for quality, security, and reliability
• Unsafe blocks (if any) have justifying comments
• The content is consistent with the UI/UX checklist
• Tests cover the new/changed behavior
• Performance impact has been considered and is acceptable

Release Notes:

• Fixed a bug where project symbols did not take you to the correct location when diffs are expanded.