Fix crash when a list updates while a screen reader reads an item

TMessagesProj/src/main/java/androidx/recyclerview/widget/GridLayoutManager.java

@@ -443,6 +443,12 @@ private int getSpanGroupIndex(RecyclerView.Recycler recycler, RecyclerView.State
         if (!state.isPreLayout()) {
             return mSpanSizeLookup.getCachedSpanGroupIndex(viewPosition, mSpanCount);
         }
+        if (viewPosition < 0 || viewPosition >= state.getItemCount()) {
+            // the position belongs to a layout that is already gone, as happens when the item is
+            // asked about from a content changed event dispatched while the list is being laid out
+            Log.w(TAG, "Cannot find span size for pre layout position. " + viewPosition);
+            return 0;
+        }
         final int adapterPosition = recycler.convertPreLayoutPositionToPostLayout(viewPosition);
         if (adapterPosition == -1) {
             if (DEBUG) {

TMessagesProj/src/main/java/androidx/recyclerview/widget/RecyclerViewAccessibilityDelegate.java

@@ -40,7 +40,13 @@ public RecyclerViewAccessibilityDelegate(@NonNull RecyclerView recyclerView) {
     }
 
     boolean shouldIgnore() {
-        return mRecyclerView.hasPendingAdapterUpdates();
+        // item positions are only settled once a layout pass is over: asking the layout manager
+        // about them from inside one, as a content changed event dispatched from layout does,
+        // would read positions that no longer exist and throw. the pre layout check is needed on
+        // its own because that event is dispatched right after the layout counter is cleared
+        return mRecyclerView.hasPendingAdapterUpdates()
+                || mRecyclerView.isComputingLayout()
+                || mRecyclerView.mState.isPreLayout();
     }
 
     @Override