Fix #13463 AutoCompleteBox should have a bindable Property for CaretIndex #13851
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What does the pull request do?
Adds caret index property to autocompletebox as discussed in #13423
What is the current behavior?
There's needed workaround, otherwise caret index can't be changed/read.
What is the updated/expected behavior with this PR?
You can modify TextBox's caret index position from AutoCompleteBox property or vice versa
How was the solution implemented (if it's not obvious)?
Adds AutoCompleteBox owner to registered CaretIndex TextBox property, also adds template binding to theme xaml files.
Checklist
Breaking changes
Obsoletions / Deprecations
Fixed issues
Fixes #13463