RFR: 8321140: Add comment to note difference in Metal's JButton margins [v2]

[Alexey Ivanov]

On Thu, 15 Aug 2024 19:12:32 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

> I moved it to `BasicLookAndFeel.java` since that's where the values are specifically defined.

Perhaps, we need a note in *both files*.

In `MetalLookAndFeel.java` to refer to `BasicLookAndFeel` where the margin is defined, similar to what's done for check boxes and radio button.

And in `BasicLookAndFeel.java` to note that the above margins are vastly different from other L&Fs.

What about this text?

**`MetalLookAndFeel.java`**

            // default margin is (2, 14, 2, 14), defined in
            // BasicLookAndFeel via "Button.margin" UI property.


**`BasicLookAndFeel.java`**

            // The above margin has vastly larger horizontal values when
            // compared to other look and feels that don't rely on these values

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PR Review Comment: https://git.openjdk.org/jdk/pull/20482#discussion_r1720049626