Provide better stack trace for overlapping edits
Provide better stack trace for overlapping edits

Overlapping indels are a bug. Checking this *always* is tricky (needs
a sorted data structure to not suffer O(N^2) perf). But
opportunistically checking small indels should give provide 80% of the
benefits.

rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer