afohrman 5ba704a273 [Predictive Back] [Side Sheet] Added updateBackProgress() predictive back support for coplanar side sheets.
Before this change, coplanar sheets responded to the sheet during finishBackProgress(), in handleBackInvoked(). After this change, coplanar sheets respond to the back progress while the predictive back event is in progress, in updateBackProgress().

PiperOrigin-RevId: 528470353
2023-05-01 10:53:53 -04:00
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