Transaction too large

Solving this might require smart handling of all data, because if a folder has 10,000 files then it's difficult to fit however we try. Probably, we need never store full collection, only what user can see at the moment.

```
java.lang.RuntimeException: android.os.TransactionTooLargeException: data parcel size 972480 bytes
at android.app.ActivityClient.activityStopped(ActivityClient.java:87)
at android.app.servertransaction.PendingTransactionActions$StopInfo.run(PendingTransactionActions.java:143)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7870)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
Caused by: android.os.TransactionTooLargeException: data parcel size 972480 bytes
at android.os.BinderProxy.transactNative(Native Method)
at android.os.BinderProxy.transact(BinderProxy.java:571)
at android.app.IActivityClientController$Stub$Proxy.activityStopped(IActivityClientController.java:1315)
at android.app.ActivityClient.activityStopped(ActivityClient.java:84)
... 9 more
```

See https://developer.android.com/guide/components/activities/parcelables-and-bundles for details.

Start by reproducing the Android TransactionTooLargeException with a folder containing around 10,000 files and read the linked Android parcelables-and-bundles guidance. Trace how the folder data is retained when the activity stops, then verify that only the currently visible collection is retained and the transaction no longer fails.

Written by the indexing model from the issue text.