[Bug 1580052] Re: Clicking twice on a point when creating a polygon

Proposed fix:

DrGPolygonBuilder>>isWanted: aMathItemCollection
^aMathItemCollection notEmpty
        and: [aMathItemCollection first isPointItem
        and: [points isEmpty
                or: [(points first = aMathItemCollection first and: [ points size > 2])
                or: [(points includes: aMathItemCollection first) not]]]]

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https://bugs.launchpad.net/bugs/1580052

Title:
  Clicking twice on a point when creating a polygon

Status in Dr. Geo II:
  New

Bug description:
  When creating a polygon, clicking twice on the same point duplicate
  it.

  The result is a polygon with duplicated point at the same position.

  This problem only occurs when clicking again on the first selected
  point. Indeed the first point can is selectable twice to close the
  polygon.

  Solution: 1st selected point can be clicked again only when at least 3
  points were already selected.

  The fix can be applied in the Polygon builder.

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