TableCellSkinBase: columnVisibility/Width should be protected

[fastegal at swingempire.de]

just noticed that I can't even compile any subclass, so filed a bug:

https://bugs.openjdk.java.net/browse/JDK-8148573

Zitat von fastegal at swingempire.de:

> On the move into public, its abstract methods columnVisibility/Width/Property
> changed scope from protected to package - this makes the base class  
> rather useless
> for extension: it's main job is sync'ing the cell's visible property to the
> column's visible property and triggering and doing the cell's layout.
> Both are possible only, if subclasses provide the column properties.
>
> Would suggest to change scope back to protected. Or any special reasons for
> not doing it?
>
> Cheers
> Jeanette