Dunno, someone could cross-quote a post in a hidden thread and it wouldn't be colored. But that's not likely either.
I think it's better to remove it.
Also too many firstElementChild.
```coffeescript
return if @isClone or @thread.isHidden or !@info.uniqueID
rgb = IDColor.compute @info.uniqueID
span = @nodes.uniqueID.firstElementChild
{style} = span
style.color = rgb[3]
style.backgroundColor = "rgb(#{rgb[0]},#{rgb[1]},#{rgb[2]})"
$.addClass span, 'painted'
$.rm span.previousSibling
$.rm span.nextSibling
```