RFR (XS): 6417721: Thread list should not allow multiple selection

[shanliang]

Looks fine to me.

Shanliang

Erik Gahlin wrote:
> Please review a small change.
>
> Description:
> If several threads are selected in the Threads list in the Threads 
> tab, some thread info is still shown in the thread info panel.
>
> Solution:
> Only allow one thread to be selected at a time, so thread info reflect 
> list selection.
>
> Bug:
> http://monaco.us.oracle.com/detail.jsf?cr=6417721
>
> Webrev:
> http://cr.openjdk.java.net/~egahlin/6417721/webrev/
>
> Testing:
> Verified that only one thread can be selected.
>
> A sponsor is needed.
>
> Thanks
> Erik