[Feature request] Add onRequestClose callback to normalize Android back and ESC key handling

[andrea-martinez-dev]

Add an onRequestClose-style callback to ModalBottomSheet that fires when the user attempts to dismiss the sheet via Android back button or ESC key, similar to React Native's Modal component.

The feature was discuessed here.

[patrickmichalik]

Hello! Thanks for the suggestion. We’ll look into it.