Yea i know, thats why i dont realy call it "dark theme" more like "high contrast mode".
The most annoying ones are the scrollbars they are realy bad and unable to change the color the "normal way" i have todo it the hacky way escpecialy in thirdparty libs like the text editor.
Its all Windows Forms not WPF so some native form controls are hacky to change the color. I try to avoid custom drawing because its all going over CPU unlike WPF.
If you want to change the syntax color you can download the custom ones
here.
For example the Visual Studio 2017 Dark theme.