Describe dragging the rows of a Variables or Properties node

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Behaviors.md

@@ -182,9 +182,10 @@ the inspector).
   gap and name (90 px) are exactly as wide as a plain row's label (124 px), a nested field's name gives up what
   its indent takes, and names are cut with `…` rather than pushing their value out of line.
 - **Reordering** (#310): variables, the fields of a struct at any depth, the items of a list and the
-  declared ports of a Start, End, `Pack`/`Expand` or shader function are **dragged by the mark in
+  declared ports of a Start, End, `Pack`/`Expand` or shader function, and the picked rows of a
+  `Variables` or `Properties` node (a row's warning travels with it), are **dragged by the mark in
   front of their row** — the kind mark, for a list item its number. Such a mark carries six faint
-  dots at its left edge, so a row that cannot be dragged (a placed object's variable, the fields of
+  dots at its left edge, 3 px clear of the edge and 3 px clear of the mark, so a row that cannot be dragged (a placed object's variable, the fields of
   a typed struct) is told apart at a glance. With the pointer on the mark the dots light up and the
   block that would go with it is washed in the accent colour. A press that moves less than
   4 px stays a click, so the kind picker of a list item still opens. A block moves with all of its