Indeed it would be nice to package a recent upstream master version including the fixes for CSS parsing errors [1].
Without these fixes, any GTK app started from a terminal polutes the terminal with all these CSS theme parsing errors... Thanks in advance to whoever could do that :) -Thomas [1] https://github.com/shimmerproject/Blackbird/commit/8ff2eb0b2a137b6de4a79c5a04f93fe0c5cf5849
