HPGAPTOL
Type: real · Stored in: session · Initial value: 0
Hatch gap tolerance: when looking for the boundary with an internal point, HATCH closes gaps of up to this length between loose endpoints, as if they were joined. With 0, the boundary must be fully closed. It accepts 0 to 5000, in drawing units.
Notes
As in AutoCAD, it is not saved in the drawing. It only counts for boundaries found from an internal point, not for selected objects.