martin rudalics <rudalics@gmx.at> schrieb am So., 3. Sep. 2017 um 13:49 Uhr:

 > The underlying issue here is that GTK no longer seems to have a concept of
 > a "background color", but Emacs still assumes that concept exists.

I understand.  But can't we catch that in a less intimidating way?

If you only talk about code restructuring, then sure. But if we want to emulate (instead of just disable) background colors, then some more work is needed.