RFR: 8289389: Fix warnings: type should also implement hashCode() since it overrides Object.equals() [v4]

[Andy Goryachev]

On Tue, 19 Jul 2022 15:48:09 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> - added missing hashCode() methods
>
> Andy Goryachev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
> 
>  - 8289389: review comments
>  - Merge remote-tracking branch 'origin/master' into 8289389.hash
>  - 8289389: minimize the impact of collision
>  - 8289389: toExternalForm()
>  - 8289389: implemented missing hashCode()

excellent suggestions, Kevin - many thanks!

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PR: https://git.openjdk.org/jfx/pull/821