In the "coal" hgweb style, there is an extra blank line after every source line in file view.

In coal style, the fileline fragment is essentially this:

  fileline = '
    <div>{line|escape}</div>'

A newline, followed by the full source line.

In paper, on the other hand, it is:

  fileline = '
    <span>{strip(line|escape, '\r\n')}</span>'

The problem is the use of <div> in coal style, because the div pushes the following newline (the one preceding the next div) down, resulting in a blank line. What I do not understand is why the newline coming from the unstripped source line does not cause another blank line.

(What I also do not understand is how a bug that was first released with Mercurial 1.3 has not been reported before; this was introduced in 835b1ee111f4.)