[9] Review request for 8152421: After initing the modality of a non-primary stage to MODAL, closing that stage causes the primary stage to become non-resizable

[Semyon Sadetsky]

Hello Kevin & David,

Please review the fix for jfx9:
bug: https://bugs.openjdk.java.net/browse/JDK-8152421

webrev: http://cr.openjdk.java.net/~ssadetsky/8152421/webrev.01/

Set window enabled logic is updated to restore window resizability 
correctly.

--Semyon