Convert all samples to AutoValue (and auto-parcel) for consistency in equals/hashcode/toString behavior + best practice about simple-stack HOT 2 CLOSED

If you mean simple-stack-example-fragments, then every "concrete" (in quotation marks) key in the sample is generated by AutoValue, which means equals and hashCode are generated by AutoValue based on the abstract field getters.

And same seems to be the case for the simple-stack-flow-masterdetail-fragments.

I think if there's a sample where this could be an issue, it's the newly added mortar-sample because that only checks against instanceof instead of true object equality. Maybe I should convert all samples to use AutoValue because nobody (hopefully) really writes this parcelable equals hashcode toString by hand anymore.

In the fragment sample, the trick is that getFragmentTag() seems to be return toString(); so it's based on the object's properties. So it should work either way.

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I've changed all samples to use auto-parcel.

AutoValue generates equals/hashcode/toString in all cases.

To remove classes from being used in equals/hashCode, you can use https://github.com/REggar/auto-value-ignore-hash-equals library.

I think that should make behavior consistent. If you see any oddity though, please report.

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