Draw an adjustable Trapezoid in Livecode - How to change x, y of the 4 corner points of a rect

[Sannyasin Brahmanathaswami]

    The good news:
    Right click on the Polygon then choose 'Reshape Polygon' and the points that you require should appear. :-)

BR: confirmed.. that works.

    Now the bad news:
    Sadly this also revealed the ghost trails seen before when you start to drag the points around. :-(
 
BR: oops, right, old bug is back…

Question: is there a way to close the polygon path? It does appear to be closed by default, but I can't actually get the last point of the last line to snap-connect to the first point of starting line… maybe that is not doable?  But, mute point since when you switch out the polygon is closed even if you have a small "x over" at the return point…