RFR: 8254676: Alert disables Tab selection when TabDragPolicy REORDER is used

[Ambarish Rapte]

On Sun, 11 Sep 2022 12:13:47 GMT, Johan Vos <jvos at openjdk.org> wrote:

> Don't set TabHeader to mouseTransparent, since it might get stuck in that state (e.g. in case an Alert is shown).
> The TabPaneSkin deals with the dragging internally, and does not require the dragged node to be mouseTransparent.

The fix looks good to me. Testing looks good.
But I am not sure why I had included this call at the time of implementation.
Requesting @kevinrushforth to take a look.

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PR: https://git.openjdk.org/jfx/pull/895