\in{hyperref}[tableref] at first char of line causes misplaced paragraph

\in{hyperref}[tableref] at first char of line causes misplaced paragraph

[Nigel King]

Hi,
This has bugged me for a number of years and I have only just realised 
the exact cause. Previous requests to solve table and figure spacing 
problems are all due to this I think. Basically the hyperreference in 
the first character of a paragraph mangles the paragraph formatting.

Below is a minimum (I think) file which demonstrates the problem very 
clearly.

\setupinteraction[state=start]
\setupwhitespace[big]
\starttext
\input tufte
\startbuffer[]
\bTABLE[width=2.5in]
\bTR \bTD \input tufte \eTD\eTR
\eTABLE
\stopbuffer
\placetable
   [right]
   [tab:1]
   {A Table}
   {\getbuffer[]}
\input tufte

\in{Table}[tab:1] this paragraph does not format correctly because the 
hypereference is at the first character of the paragraph. Note that the 
spacing (before) is incorrect as well as the width.

T\in{able}[tab:1] this paragraph does format correctly because the 
hypereference is not using the first character of the paragraph.

\input tufte
\stoptext

TIA

Nigel King

Re: \in{hyperref}[tableref] at first char of line causes misplaced paragraph

[Hans Hagen]

Nigel King wrote:
> Hi,
> This has bugged me for a number of years and I have only just realised 
> the exact cause. Previous requests to solve table and figure spacing 
> problems are all due to this I think. Basically the hyperreference in 
> the first character of a paragraph mangles the paragraph formatting.
> 
> Below is a minimum (I think) file which demonstrates the problem very 
> clearly.
> 
> \setupinteraction[state=start]
> \setupwhitespace[big]
> \starttext
> \input tufte
> \startbuffer[]
> \bTABLE[width=2.5in]
> \bTR \bTD \input tufte \eTD\eTR
> \eTABLE
> \stopbuffer
> \placetable
>   [right]
>   [tab:1]
>   {A Table}
>   {\getbuffer[]}
> \input tufte
> 
> \in{Table}[tab:1] this paragraph does not format correctly because the 
> hypereference is at the first character of the paragraph. Note that the 
> spacing (before) is incorrect as well as the width.
> 
> T\in{able}[tab:1] this paragraph does format correctly because the 
> hypereference is not using the first character of the paragraph.
> 
> \input tufte
> \stoptext

add this to cont-new.tex

\newbox\@@dlhbox

\def\dontleavehmode
   {\ifhmode\else \ifmmode\else
      \setbox\@@dlhbox\hbox
        {\mathsurround\zeropoint\everymath\emptytoks$ $}\unhbox\@@dlhbox
    \fi \fi}

and test this on all kind of docs! I'm not that sure about the patch.

The reason for this is that we cannot use \noindent or \indent and \leavevmode.

Future versions of pdftex will provide \quitvmode for this purpose, which has no 
side effects.

Hans





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