[Fixed] New test release, please test

[tkbd]

Thanks for Update.I tried display test in v2.1.2.
Now,edge display and wireframe display is good

But,In 2ndary-Selection when multi-selection mode and face selection mode,
(For Example,Face>Extrude>RMB,Face>Sweep>RMB,Face>Rotate>RMB, maybe MMB too...)
Select area when the cursor touches the surface will disappear temporarily.
Therefore, it looks flickering and move the cursor on the object.
Also, Selected area doesn't display if there are spans for multiple objects the selection.

I took the screen cast movies.

OSX 10.11.6
Wings3D 2.1.2