- (#<widget> 'coords tagOrId)
- returns a list whose elements are the coordinates of the item named by tagOrId.
- (#<widget> 'coords tagOrId ?x0 y0 ...?)
- (#<widget> 'coords tagOrId ?coordList?)
- replace the current coordinates for the named item. If tagOrId refers to multiple items, then the first one in the display list is used.
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