Fix bad unicode calculations in do_completion (#28259)

Co-authored-by: João Marcos <marcospb19@hotmail.com>

Release Notes:

- Fixed a panic with completions around non-ASCII code

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Co-authored-by: João Marcos <marcospb19@hotmail.com>
448db20eaaConrad Irwin committed on 4/7/2025, 10:45:29 PM· committed by GitHubparente4a6943
2 files changedLine totals unavailable