NPE when spying on android.os.Handler class on Android API 28+

[naquden]

When using Mockito.spy(handler) the mQueue member variable is not copied over the to spy object.

Mockito :org.mockito:mockito-android
Mockito version used: 3.0.0

Sample:
Handler preHandler = new Handler(testApplication.getMainLooper());
spyHandler = spy(preHandler);

^ The preHandler has a mQueue variable set but the spyHandler does not.
When going through source code I noticed that the fields returned from Handler.class.getDeclaredFields() differs from API 28+ and API < 28.
This causes the org.mockito.internal.util.reflection.LenientCopyTool#copyValues to fail to copy the mQueue variable from the spiedInstance on API 28+

It's important for the the mQueue to be copied as well since it's not null checked in the Handler class final methods.