IFill-able Shapes do not respect 'HDR color pickers' option

Steps to Reproduce:

In the Editor:

- Check Shapes Settings > Interface: HDR color pickers

- Create a Polygon

- Check the 'Fill' box

- Observe that the start and end colors are not HDR colors (There's no text saying 'HDR' across the color, if I copy an HDR color from elsewhere in my project and paste it into the start or end color of the Fill panel, the HDR color gets clipped to RGB 0.0-1.0, etc.)

Notes: 

1) The main 'Color' field of a Polygon *is* HDR compatible, but Fill gradient Start and End colors are not

2) In code I can successfully assign an HDR color to the Fill Start and End colors and the HDR color works properly, but you can't assign an HDR color in the editor

(BTW, Shapes is *amazing*!! Love it! And all your work!)