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About
An onRequestClose prop on the BottomSheet. This prop should accept a function returning a Promise, which should be run between user dismissal/closing interaction and the sheet actually closing (to index -1). The return value of the promise should in turn decide whether to proceed with closing the sheet.
Motivation
In certain situations, it would be very useful to be able to interrupt any dismissal/closing of the sheet, eg. if there is unsaved changes in a form, or if some process is running. This would eg. allow you to prompt the user with an alert to confirm ending whatever workflow they are currently in.
Attempts to solve feature request #1318