TreeNode:Selection

Build 19901 on tree-highlight-performance
Reviewing disabled
Baseline History
Build 1990143c0d32
Current build. There are unaccepted changes, so build 19863 is still the baseline.
Build 19241b077fb7
Accepted by Gert Hengeveld.
Build 19224871fe72
Accepted by Michael Shilman.
Commenting is disabled because there's a newer build on this branch