Auto scrolling a locked field when mouse comes to edge

[David Epstein via use-livecode]

When the mouse drags across text in an unlocked (horizontally and vertically) 
scrolling field, the field automatically scrolls at a legible rate to display 
the (previously hidden) text that the mouse was dragging toward.
Has anyone scripted a way to reproduce this effect for a locked field?
Many thanks.
David Epstein
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