On 1/12/2016 7:29 PM, Wolfgang Schuster wrote:

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Alan BRASLAU mailto:alan.braslau@cea.fr 12. Januar 2016 um 19:07 Hello,

Jean-Michel pointed out to me the following curiosity:

\starttext \input tufte \startalignment[middle] \input ward \stopalignment \input tufte \stoptext

The startalignment applies to the preceding text, too. Strange... It’s a normal behaviour for TeX, the question is should \startalignment end the previous paragraph or not.

when tex breaks a paragraph into lines the current values of relevant parameters is used (left and right skips, spacing, etc) \bgroup \raggedright \inptu tufte \par \egroup \bgroup \raggedright \inptu tufte \egroup \par

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I never noticed this before as I have the habit of coding \startalignment\stopalignment blocks set-off with leading and trailing blank lines for better readability. But such practice could lead to undesired results. Consider the following example:

\setupwhitespace [big]

\starttext \input tufte

\startalignment[middle] \input ward \stopalignment \input dawkins \stoptext

So \stopalignment implicitly imposes a \par. If I were to omit the blank line before \startalignment so that no big whitespace be included before the centered block, the tufte text will get middle aligned. Also, perhaps I might not wish for the dawkins text to be separated by a big whitespace, logically as in: You can use \startpacked … \stoppacked to suppress blank lines inserted by \setupwhitespace.

Wolfgang

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On 1/12/2016 9:43 PM, Alan BRASLAU wrote:

On Tue, 12 Jan 2016 21:07:38 +0100 Hans Hagen wrote:

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...

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The startalignment applies to the preceding text, too. Strange... It’s a normal behaviour for TeX, the question is should \startalignment end the previous paragraph or not.

when tex breaks a paragraph into lines the current values of relevant parameters is used (left and right skips, spacing, etc)

I guess that I do not know TeX well-enough to understand why your MWE below gives different line breaks.

\starttext

\bgroup \raggedright \input tufte \par \egroup

\bgroup \raggedright \input tufte \egroup \par

\stoptext

because the par builder kicks in when \par is issued so when that happens after teh group the settings for left/rightskip used are not the one inside the group Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------