Closes #51573
Closes #52852 * I believe, looking for verification of that.

A very similar issue was belived to be fixed with #51642 , however it seems like there is still some edge cases that were causing crashes. These issues appeared to me to be caused by the dedup method failing to catch sub-ranges (created by entering SelectMode after the search) as duplicates.

two new tests that isolate the case in 51573 and 52852 respectively.

fixed vid:

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:

• helix: Fix search selection range deduplication logic