RFR: 6852577: Only for Nimbus LAF UIManager.get("PasswordField.echoChar") is null [v3]

[Prasanta Sadhukhan]

On Thu, 8 Sep 2022 23:40:59 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

>> "*" is the default char unless overridden by echoChar property and is set [here](https://github.com/openjdk/jdk/blob/master/src/java.desktop/share/classes/javax/swing/JPasswordField.java#L178)
>
> I just found my comment at that bug that the ui properties for nimbus are stored in the "skin.laf" and the "echoChar" is missed there. This is the reason why the UIDefaults table is small in Nimbus, unlike Metal where we have a long list of properties. Take a look to the `NimbusDefaults.java` which is generated during the build it contains all the props, and it is a place where I think we should update the echoChar.

It will have the problem as you mentioned so I did it as it is. Since we have already UIDefaults table defined, I think it can be used for this, without changing the doc which might cause compatibility issues.

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PR: https://git.openjdk.org/jdk/pull/10035