Have any of you noticed this odd striped that seperates sticky threads from regular threads ? I call it stealth stripe because it just now dissappeared and it was what tickled my interest what a mystery lol

 

"view source" of the current version does not show anything.

But, it could have been easily done with an include of a table row that mimics a thick line using styles.

If the include went missing during a site edit, then the line would disapppear.