Feature request: syntax highlighting on the custom rule filtering page

Just like uBlock Origin, I think it would be useful to have some minimal syntax highlighting on the custom filtering rules page. However, this might increase binary size too, so I don't know how do I feel about this one. I'm probably one of the small number of users that uses this on a regular basis, but this might not be the case for a lot of users of AGH. Please comment if you have any suggestions.