Fix crash when LSP returns multiple nested definition ranges (#52701)

This fixes a crash when navigating to multiple definitions in a
singleton buffer (https://github.com/zed-industries/zed/pull/51461).

Release Notes:

- N/A
501e72dbe7Max Brunsfeld committed on 3/30/2026, 7:34:29 AM· committed by GitHubparent49ed4dc
2 files changedLine totals unavailable