I'm using Notepad++, and can't get user-controlled comment folding to work. It's supposed to be part of the GmodLua this is based off of.
At least
this wiki page says
A line with either --{, --}, //{ or //} will also fold.
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edit: I found the code responsible and WowLua doesn't use it because it rewrote the folding logic. I could add the feature back, if you have some information about how this is compiled, which version of Visual Studio, and what other projects it depends on. I know the C++, but not all the details of how the build environment is setup for this.