Thanks Simon, I've just tested Debian Testing (Bullseye), with src:sugar 0.117-3, src:sugar-artwork:0.117-1, src:sugar-terminal-activity version 47-1, src:vte2.91 version 0.62.0-1, and GTK 3.24.23-1 but do not see any problem.
The terminal is correctly rendered in black on white or white on black modes. I've looked at our GTK themes in https://github.com/sugarlabs/sugar-artwork but they are unmaintained; changes to the GTK builtin theme since 3.20 are yet to be cascaded. Is there a way to reproduce the problem? Please review https://github.com/sugarlabs/sugar-artwork/pull/117 -- James Cameron http://quozl.netrek.org/