hey there
got a gui bug
attached a screenshot
greetings
jojo

TL;DR
Add "get_contents()" to class LuaFluidBox


What ?
http://lua-api.factorio.com/latest/LuaFluidBox.html

Why ?
Color Fluid Trains with
https://mods.factorio.com/mod/Train_Ore_Color-016

I can´t program so that would be an easy way for me to add them into the mod :)

Greetings
Jojo