[8] Review request for 8023474: First mousepress doesn't start editing in JTree

[dmitry markov]

Hello,

Could you review the fix, please?
    bug: http://bugs.sun.com/view_bug.do?bug_id=8023474
    webrev: http://cr.openjdk.java.net/~dmarkov/8023474/webrev.00/
The method BasicTreeUI.startEditing() should find the first valid root 
for the editingComponent and call validateUnconditionally() for it 
instead of editingComponent.revalidate() invocation.

Thanks,
Dmitry