* New feature (betweenThreshold) to drop an item between two other tree nodes, rather than into a tree node. Allows user to control position element appears in a child list.
* Can now hover/click over entire tree row, even to the left of the expando (plus/minus sign). The highlighting affect also spans the whole width of the row.
Note that it's using transparent png images for the row highlighting hover effect, so that hovering over a tree row doesn't block out the grid lines behind it. Developers have the choice of overriding this styling by:
o not using grid lines at all
o not using a full-width background hover effect
In either of the above cases, users can use a plain background-color CSS rule w/out interfering w/the grid lines.
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