On 10/13/2016 8:33 AM, Joseph Wright wrote:

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Testing LuaTeX v1, there are relatively few changes from v0.95. However, I've found one logging (?) change and one hyphenation change I didn't expect. With example \hsize 15em This is a supercalifragilisticexpialidocious% \hbox to 1em{} sentence. \tracingall \belowdisplayskip=0pt % $$ y = mx + c $$ \bye The results are different from pdfTeX in two ways. The empty \hbox does not prevent hyphenation, which it has to-date (so this is not a result of other hyphenation changes). The log also lacks the zero skip after the display. It's not clear to me if either of these changes is deliberate: what's the situation?

`The criteria for not hyphenating are somewhat arbitrary esp since`

`engines started adding features (literals, whatsits, etc). So, why stop`

`at a whatsit that in fact could be a box (ximage) but not at a hbox and`

`what about rules (ximages are no longer whatsits but a kind of rule). So`

`this is what happens now:`

\hyphenationbounds: 0 : not strict 1 : strict start 2 : strict end 3 : strict start and strict end So the rules are (i'll add the next info to the manual): start: boundary : yes when wordboundary hlist : when hyphenationbounds 1 or 3 vlist : when hyphenationbounds 1 or 3 rule : when hyphenationbounds 1 or 3 dir : when hyphenationbounds 1 or 3 whatsit : when hyphenationbounds 1 or 3 glue : yes math : skipped glyph : exhyphenchar (one only) : yes (so no -- ---) otherwise : yes end: boundary : yes glyph : yes when different language glue : yes penalty : yes kern : yes when not italic (for some historic reason) hlist : when hyphenationbounds 2 or 3 vlist : when hyphenationbounds 2 or 3 rule : when hyphenationbounds 2 or 3 dir : when hyphenationbounds 2 or 3 whatsit : when hyphenationbounds 2 or 3 ins : when hyphenationbounds 2 or 3 adjust : when hyphenationbounds 2 or 3 So you can decide to default to \hyphenationbounds=3 Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------