Hi
Actually I think there is some other room for improvement
Attached the picture for syntax highlight in C/C++ for left operand and right operand, taken from the last version of the theme
The problem I saw when I filled the ticket was affecting the left operand, and as you can see your fix is very good
But the right operand, even if readable, is not very good. The highlight just turn the background from dark grey to black and as you can see, it is not so evident
Maybe you can implement some better highlight
Bye