RFR: 8258777: SkinBase: add api to un-/register invalidation-/listChange listeners [v8]

[Jeanette Winzenburg]

On Mon, 12 Apr 2021 13:24:18 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> 
> The Draft CSR looks good, and should keep the monsters contained. �� Go ahead and move it to Proposed.

thanks, done :) Also updated to the most recent state (including Nir's suggestion).

-------------

PR: https://git.openjdk.java.net/jfx/pull/409