dial/gauge: primary arc should reflect the color of the currently breached threshold.

[diehbria]

currently arc is always a solid blue color.

[jiaoyangChen]

Hi there. I am trying to clarify the priority of breached threshold.color, stream.color, default color.blue. Is breached threshold.color> stream.color>default color.blue?

[tracy-french]

Yep, that is the correct priority!