<Swing Dev> [9] Review Request: 6573305 Animated icon is not visible by click on menu

[Sergey Bylokhov]

Hello.
Please review a fix for jdk 9.
When we paint some image on component we use this component as an 
observer, which will be called when the image should be repainted(in 
case of animated gif for example). But our code in the 
AbstractButton.imageUpdate() will replace correct Icon to null if button 
is pressed, disabled, etc(if such icon was not set of course). After the 
fix we will use default icon only if more specific image was not found.

Bug: https://bugs.openjdk.java.net/browse/JDK-6573305
Webrev can be found at: http://cr.openjdk.java.net/~serb/6573305/webrev.00

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Best regards, Sergey.