RFR: 4346610: Adding JSeparator to JToolBar "pushes" buttons added after separator to edge

[Sergey Bylokhov]

On Thu, 27 Jul 2023 14:30:23 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> Adding buttons in a JToolBar after a JSeparator will push the button to the far right of the frame instead of just after the separator
> 
> ![image](https://github.com/openjdk/jdk/assets/43534309/7fcad657-493f-4370-b046-b31c212a8aa7)
> 
> This is because BasicSeparatorUI does not define a maximum size. This leads to the separator getting all the extra width.
> Fix is made to limit the separator's maximum size to the preferred size of corresponding orientation (i.e. width for VERTICAL and height for HORIZONTAL)

Your master is from Jun 12, 2023

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PR Comment: https://git.openjdk.org/jdk/pull/15054#issuecomment-1654965643