Indentation option might add an extra space

The following code renders differently in the browser whether the indent option is enabled or not:

  <p>
   <span class="some padding ............................">some text here
    . and here
   </span>
  </p>

A line break is inserted between the two txt nodes. The extra breaks inside the p elements also change what C-A, C-C copies into the clipboard.

open Tyxml.Html

let content =
  html
    (head (title (txt "example")) [])
    (body
       [
         p
           [
             span
               ~a:[ a_class [ "some padding ............................" ] ]
               [ txt "some text here"; txt ". and here" ];
           ];
       ])

let () =
  Format.printf "%a" (pp ~indent:true ()) content

Start with the pp ~indent:true () entry point shown in the OCaml example and reproduce the rendered HTML in a browser with indentation enabled and disabled. Trace how adjacent txt nodes in the span and p elements are formatted; the fix is done when indentation no longer changes visible spacing, line breaks, or copied clipboard content.