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Fix SelectableTextBlock selection when text content changes - #21894
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…UI#21894) * Fix SelectableTextBlock selection when text content changes * Clean up
MrJul
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What does the pull request do?
Updates
SelectableTextBlockselection state when itsTextproperty changes or itsInlinescollection is modified.SelectionStart and SelectionEnd are coerced against the updated content, consistent with
TextBoxandTextPresenterbehavior.Checklist
Fixed issues
Fixes #21893