RFR: 8348170: Unnecessary Hashtable usage in CSS.styleConstantToCssMap

[Andrey Turbanov]

On Thu, 16 Jan 2025 11:53:18 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> There is a field `javax.swing.text.html.CSS#styleConstantToCssMap` which uses legacy `Hashtable` class.
> As this map is read-only and all its content is initialized in `<clinit>` we can safely use immutable `Map` instead.

Thank you for review!

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PR Comment: https://git.openjdk.org/jdk/pull/23149#issuecomment-2612609426