RFR: 8292738 : JInternalFrame backgroundShadowBorder & foregroundShadowBorder line is longer in Mac Look and Feel

[lawrence.andrews]

On Mon, 22 Aug 2022 21:20:54 GMT, lawrence.andrews <duke at openjdk.org> wrote:

> Border line is seen outside  round Rectangle both for JInternalFrame backgroundShadowBorder & foregroundShadowBorder line in mac L&F.
> ![Screen Shot 2022-08-22 at 4 17 49 PM](https://user-images.githubusercontent.com/87324768/186021010-d21aed21-9e05-4b28-846b-2628e367f183.png)
> 
> I have circled the extra part of the line. To make it more visible I changed the color of the backgroundShadowBorder to red
> ![Screen Shot 2022-08-22 at 4 17 37 PM](https://user-images.githubusercontent.com/87324768/186021095-cbfffdba-d43a-47e7-a50b-551c59cb767b.png)
> 
> Fixed the extra length of the line 
> ![Fixed](https://user-images.githubusercontent.com/87324768/186021195-688c3613-fc50-41c3-8cad-94173385dfeb.png)

Yes, this is not a regression & I was able to reproduce this from JDK 1.8.0_201
The line was looking odd hence I added a fix.

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PR: https://git.openjdk.org/jdk/pull/9971