The DisposableEffect's OnNewIntentListener is invoked on the main thread
when a new ACTION_SEND intent arrives (e.g. SwiftKey sharing a GIF). It
called contentResolver.getType() synchronously, which can Binder-IPC to
a remote content provider and block for tens to hundreds of milliseconds.
Use rememberCoroutineScope() + scope.launch(Dispatchers.IO) since
DisposableEffect has no coroutine scope of its own. The scope is tied to
composition and cancels cleanly on disposal.
Also fix a latent bug: the consumer read activity.intent instead of the
intent parameter passed into the callback. activity.intent is the
Activity's launch intent, not the new one that triggered the listener,
so subsequent intents would reuse the first intent's URI.
davotoula
d506330cc7