[Bf-committers] Theme gradient for 3D viewport - notification for theme maintainers

[Antony Riakiotakis]

Hi, a notification for theme maintainers (especially contrib themes,
since trunk was fixed): In 3D viewport, where gradient is used, the
'back' property of the generic theme is not used anymore. In fact, we
don't use ThemeGeneric anymore, rather, we use ThemeGradient. Make
sure to use the high_gradient property of ThemeGradientColors instead.
For instance, see commit 54439.