Editor: can't edit/create CollisionPolygon2D's polygons

[ghost]

Operating system or device - Godot version:
Latest commit of Godot on Linux (Lubuntu 17.04)

Issue description:
after selecting a CollisionPolygon2D in the editor and pressing the pencil icon (create polygon from scratch) clicking on the 2d editor window doesn't do anything.

What it was expected to do
create and edito polygons for the CollisionPolygon2D

Steps to reproduce:
select a CollisionPolygon2D, select pencil icon and attempt to draw polygons

[HummusSamurai]

See this PR and this issue.

Could be a duplicate.

[akien-mga]

Assumed fixed by 41c3ca3.

[NullNeska]

it didn't @akien-mga

[reduz]

tested it, works fine