It looks nice, but it doesn't seem to support code folding, nor does it have
syntax coloring for numbers.

Otherwise, it looks nice, and the latest version seemed to handle Ruby
coloring just fine (though it was a bit confusing because Ruby wasn't listed
in the "Syntax Type" list).  I didn't have to download the special Ruby
Syntax Coloring file you linked to; it was already there when you install
3.60.

Chris