RFR: 8243115: Unregister bindings when unbind called multiple times

[Kevin Rushforth]

On Mon, 27 Apr 2020 11:43:28 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

> This fixes a bug where the first call to unbind would clear the internal invalidation listener used, resulting in
> subsequent unbind calls to be no-ops, unless bind was called again first.
> I had to rewrite the parameterized test slightly as Parameterized will only call the parameters method once, and my new
> test modifies the internal state of the bindings used as parameters (by doing some unbind calls) which was making other
> tests fail.

The title of this PR should match exactly the title of the JBS bug. So:

8243115: Spurious invalidations due to bug in IntegerBinding and other classes

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PR: https://git.openjdk.java.net/jfx/pull/198