IssueTracker

Consider following class structure:

public abstract static class RecyclerView.Adapter {
        public void setHasStableIds(boolean hasStableIds) {
            if (hasObservers()) {
                throw new IllegalStateException("Cannot change whether this adapter has "
                        + "stable IDs while the adapter has registered observers.");
            }
            mHasStableIds = hasStableIds;
        }
}

public class SimpleWrapperAdapter extends RecyclerView.Adapter {
    public SimpleWrapperAdapter(RecyclerView.Adapter adapter) {
        mWrappedAdapter = adapter;
        mBridgeObserver = new BridgeAdapterDataObserver(this, mWrappedAdapter, null);
        mWrappedAdapter.registerAdapterDataObserver(mBridgeObserver);

        super.setHasStableIds(mWrappedAdapter.hasStableIds());
    }

    @Override
    public void setHasStableIds(boolean hasStableIds) {
        super.setHasStableIds(hasStableIds);

        if (isWrappedAdapterAlive())
            mWrappedAdapter.setHasStableIds(hasStableIds);
    }

    public boolean isWrappedAdapterAlive() {
        return mWrappedAdapter != null;
    }
}

class SwipeableItemWrapperAdapter extends SimpleWrapperAdapter {
    public SwipeableItemWrapperAdapter(RecyclerViewSwipeManager manager, RecyclerView.Adapter adapter) {
        super(adapter);
        mSwipeManager = manager;
    }
}

Here is how 'SwipeableItemWrapperAdapter' class looks like after minification:

public class SwipeableItemWrapperAdapter extends RecyclerView.Adapter {
   public SwipeableItemWrapperAdapter(RecyclerViewSwipeManager var1, Adapter var2) {
      this.mWrappedAdapter = var2;
      BridgeAdapterDataObserver var3 = new BridgeAdapterDataObserver(this, var2, (Object)null);
      this.mBridgeObserver = var3;
      this.mWrappedAdapter.mObservable.registerObserver(var3);

      boolean var4 = this.mWrappedAdapter.mHasStableIds;
      super.setHasStableIds(var4);
      if (this.isWrappedAdapterAlive()) {
         this.mWrappedAdapter.setHasStableIds(var4);
      }

      this.mSwipeManager = var1;
   }
}


As result, when we try to instantiate 'SwipeableItemWrapperAdapter' class, we got exception: IllegalStateException: "Cannot change whether this adapter has stable IDs while the adapter has registered observers."

This happens because R8 incorrectly inlined body of method 'setHasStableIds' from 'SimpleWrapperAdapter' class instead of 'RecyclerView.Adapter' class.

This bug is reproducible on AGP 3.6.0-rc1 and 4.0.0-alpha09, but AGP 3.5.3 does not have this issue.
I have attached android project with reproducer. If you run app in release build it will crash with exception describer above.