I've developed a plugin (with guidance from Lex Trotman) that implements bracket pair colorization based on nesting level. This makes it easier to find start/end braces in deeply nested code that's included in many IDEs (e.g. VS Code) and I wish were in Geany (my favorite IDE). Attached is a demo. 

I submitted a pull request here: https://github.com/geany/geany-plugins/pull/1221

I'd love to hear thoughts and feedback .

Thanks, 

Asif Amin