1436054 - Shapes editor: inherit original units when adding new points to a polygon

Status: NEW

(DevTools :: Inspector, enhancement, P3)

Description

[Razvan Caliman [:rcaliman]]

Attachment: Screen Shot 2018-02-06 at 10.15.53 AM.png

When adding new points to a polygon shape, the editor defaults to using percentages as units. Instead, it should respect the unit types for the coordinates originally defined.

Steps to reproduce:

- Paste and run the following in the URL bar:

data:text/html,<style>div {width:100px;height:100px;background:red;clip-path:polygon(0px 0px, 100px 0px, 100px 100px);}</style><div>

- Open inspector
- Open shapes editor
- Double click an edge of the polygon to add a new point

Result:
Coordinates for new point are percentages.

Expected:
Coordinates for new points are pixels.

Known complications:
- mixed units 
- unitless zero along other unit