fix: Consider utf16 chars in texte editor cursor_up

[marc2332]

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[Copilot]

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.71%. Comparing base (8353491) to head (8053065).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1143   +/-   ##
=======================================
  Coverage   74.71%   74.71%           
=======================================
  Files         233      233           
  Lines       29106    29106           
=======================================
  Hits        21746    21746           
  Misses       7360     7360           

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