Request for review: 7131752 [macosx] Multiselect List doesn't display scrollbar after consecutive additions

[Sergey Bylokhov]

Hi Everyone,
We should invalidate list component, when its state changed and then we 
should validate its container.

Bug: http://monaco.sfbay.sun.com/detail.jsf?cr=7131752
Webrev can be found at: http://cr.openjdk.java.net/~serb/7131752/webrev.00/

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Best regards, Sergey.