+ Adwaita: The tabs are transparent still, although we are setting background-color: @bg_color; Maybe Adwaita does not define @bg_color? What does it use instead? DONE
Turns out there are "public" and "private" colour definitions. I was trying to use an internal Ambiance colour (@bg_color), which is why it broke on Adwaita. Needed to switch to @theme_bg_color.
Also tweaked so fix for Adwaita is always applied, not just when splitter handle size is overridden.
+ Adwaita: The tabs are transparent still, although we are setting background-color: @bg_color; Maybe Adwaita does not define @bg_color? What does it use instead? DONE
Turns out there are "public" and "private" colour definitions. I was trying to use an internal Ambiance colour (@bg_color), which is why it broke on Adwaita. Needed to switch to @theme_bg_color.
Also tweaked so fix for Adwaita is always applied, not just when splitter handle size is overridden.