RFR: 8313403: Remove unused 'mask' field from JFormattedTextField

[Alexey Ivanov]

On Thu, 17 Aug 2023 21:37:17 GMT, Phil Race <prr at openjdk.org> wrote:

>> The private field `mask` is never used in `JFormattedTextField`.
>> 
>> I couldn't find any usages of the field, including JNI. Therefore, it is safe to remove.
>
> Marked as reviewed by prr (Reviewer).

@prrace could you confirm, please? No CSR is required to remove an unused private field from classes in Swing because the specification for Swing classes states, “Serialized objects of this class will not be compatible with future Swing releases.”

It is to resolve @mrserb's concern raised above.

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PR Comment: https://git.openjdk.org/jdk/pull/15088#issuecomment-1684233788