Source.IsDraggable listed Image/Web/Chat/Alert only, so a blur had no selection box, no corner
handle, and no hit-test — the rectangle existed in the render but could not be grabbed. Adding
Blur to that list gives it the same selection chrome and resize path every placeable layer has
(drag to move, corner dot to resize, one undo snapshot per gesture).
It is selected on add (AddSource already does that), so the rectangle appears already outlined
and ready to size.
gramps
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