TextArea.LineNumber Can't Handle Large Position Parameter

Xojo 2021r2.1

I have a TextArea with lots of lines, like 10,000 or more, and am trying to implement a simple search function:

Var Position As Integer =TextArea1.Text.IndexOf(SearchStart, searchText)
If position > -1 Then
  Var LineNumber As Integer = TextArea1.LineNumber(Position)

With a MacOS target, it works fine.
With Windows as the target, it finds Position quickly enough, but completely chokes on LineNumber(Position) - just freezes, whether free-running or single-stepping.

Is there a workaround, or a better control?

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