[MaterialContainerTransform] RecyclerView content is gone during transition when LinearLayoutManager.recycleChildrenOnDetach = true

Description: I'm using MaterialContainerTransform in a fragment transition.

I see that RecyclerView#onDetachedFromWindow() gets called immediately as soon as the transition starts unlike onDestroyView() that waits for the transition to end. For performance improvement, I'm setting LinearLayoutManager#recycleChildrenOnDetach to true. This flag makes LinearLayoutManager#onDetachedFromWindow() clear the views in the RecyclerView causing the screen to turn blank when the transition starts. (ref)

The real issue is that RecyclerView#onDetachedFromWindow() doesn't wait for the transition to complete. In a regular fragment transition without MaterialContainerTransform, this method gets called only after the transition is completed.

Source code: https://github.com/mkano9/material-container-transform-recycleChildrenOnDetach/tree/master
See FirstFragment

Video: https://user-images.githubusercontent.com/57272551/105796603-0c143d80-5f44-11eb-994b-a2dc8196cdd2.mp4

Android API version: 30

Material Library version: 1.3.0-rc01

Device: Pixel 3 XL

Beginne damit, das verlinkte Reproduktionsprojekt auszuführen und app/src/main/java/com/example/materialcontainertransformplayground/FirstFragment.kt im Umfeld des gemeldeten Übergangs zu lesen. Verfolge den MaterialContainerTransform-Fragmentübergang zusammen mit RecyclerView#onDetachedFromWindow() und LinearLayoutManager#recycleChildrenOnDetach; abgeschlossen ist die Aufgabe, wenn der Inhalt von RecyclerView während des gesamten Übergangs bei aktiviertem Flag sichtbar bleibt.