Fix #14216 Incorrectly Ordered Character Input in AutoCompleteBox #14264
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What does the pull request do?
Fixes AutoCompleteBox's "jumping" caret index causing incorrectly ordered text input as mentioned in #14216
What is the current behavior?
Typed characters are incorrectly ordered.
What is the updated/expected behavior with this PR?
Normal text input.
How was the solution implemented (if it's not obvious)?
Checklist
Breaking changes
Obsoletions / Deprecations
Fixed issues
Fixes #14216 caused by #13463