Re: missing interword spaces

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On Tue, 3 Jun 2025, Ross Moore wrote:

> Hi Karl, Thanh.
> 
> OK. Here’s the real problem, cut down to bare minimum.
> The source document is for Plain TeX.
> 
> 
> [IMAGE]
> 
> 
> 
> The interword space between glue and the \pdfliteral  is what is missing.
>  (Overfull lines was a probably a furphy.)
> 
> A PdfTeX-Space character needs to be inserted either
>  1. *before* the  ET preceding the  \pdfliteral{EMC} , or
>  2. within its own BT .. ET sequence preceding the EMC .
> This is for the glue that is evident in the shipped-out tracing in the 
> .log  file.
> 
> 
> The next image shows how this affects a real-world document, that is fully
> tagged.
> The marked content sequences correspond to meaningful pieces of text that
> are used to build a bibliography entry.
> 
> 
> [IMAGE]

In the typeset output, what's the vertical rule that precedes and
overprints the "M" in "Maron"?  That's very peculiar.
 						-- bb

> In that last image, the blue boxes and arrows show where I’ve been able to
> include \pdffakespace  explicitly into the LaTeX-code expansions, to
> compensate for pdfTeX not (yet) putting it in automatically.
> The red box is where I’ve not yet succeeded in finding the correct place
> (within amazingly complicated macro processing) to insert the \pdffakespace
> .
> 
> My contention, however, is that this should not be necessary.
> Rather, pdfTeX ought to be identifying that the glue is due to a visual
> space in the content,
> placed either explicitly in the source, or inserted via a \space (or
> similar) LaTeX or TeX macro.
> 
> Note that it might be useful to allow other primitives between letters, the
> glue, and the \pdfliteral{EMC}.
> In programming for this, I changed the order of the \pdfliteral{EMC} and the
> \write3{…} command, in case that affects the result — it doesn’t.
> 
> 
> Hope this helps.
> 
>         Ross
> 
> [...]
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