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fix(InputSelectize): Fix InputSelectize set method to clear selections #2024

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Updated the InputSelectize.set method to remove all selected items before setting new selections. Added regression test and example app to verify that selections are properly cleared when setting an empty list.

fixes #2013

Updated the InputSelectize.set method to remove all selected items before setting new selections. Added regression test and example app to verify that selections are properly cleared when setting an empty list.

fixes #2013
@karangattu karangattu requested a review from schloerke July 8, 2025 09:08
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If the user uses a custom selectize, then it could break this logic

Updated the selector for removing selectize items to target only direct children, ensuring correct clearing behavior. Enhanced the test app to display selected values and expanded the test cases to verify selection and clearing of multiple choices.
Imported Inputs, Outputs, and Session from shiny.session and updated the server function signature to include type annotations for improved type safety and clarity.
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[Bug]: controller.InputSelectize(...).set only works once with multiple selections
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