Many cursor themes (such as quintom) do not ship with a index.theme file. Instead, they ship with a cursor.theme file. The syntax is indentical. Some ship with both as well.
As of now, nwg-look seems to only look for the index.theme file, and since the theme didn't have it it didn't show up in the cursor list.
Many cursor themes (such as quintom) do not ship with a index.theme file. Instead, they ship with a cursor.theme file. The syntax is indentical. Some ship with both as well. As of now, nwg-look seems to only look for the index.theme file, and since the theme didn't have it it didn't show up in the cursor list.