Widget/Header Separators: Background Image Should be Applied to Entire Page

Currently if a background image is used, widget/header separators do not display the image, rather the background color noted under the specific page and/or global styles is displayed:

Styles Desktop > Background Color

It has been requested that the background of these separators pick up a background image if one has been selected, as this is (typically) more aesthetically pleasing. Please see attached for an example.