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I have just uploaded the archives for a new luatex release, 0.50.0.
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This release starts a new chain of stable beta's.
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* Fonts now listen also to the 'extend' key in the lua font
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metrics table, and the processing for this is done via de
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pdf text matrix instead of via the font matrix, which means
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it now works for all font types.
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* The embedded Metapost library is now at version 1.209.
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* It is no longer possible for fonts from embedded pdf files
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to be replaced by / merged with the document fonts of the
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enveloping pdf. This regression may be temporary, depending
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on how the rewritten font backend will look after beta 0.60.
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* Use of \middle confused the \mathstyle operation.
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* \pdfcolorstack handling was broken.
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* node.unset_attribute() had a bug whereby it inverted the
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requested result in some cases (the node on which the unset
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was called was sometimes the only node at the current level
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that *kept* the attribute).
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* During font expansion, the internal font copy had one character
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information object less than the original, resulting in the
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disappearance of a glyph in some fonts when font expansion
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* Placement of operator scripts of OT MATH fonts is adjusted
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to be conformant with Word's logic where the italic correction
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is only used to tuck in the subscript and for nothing else.
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* luafontloader.open() no longer writes directly to stderr in
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case of internal font errors.
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* Any <pdf_refobj_node>.objnum could not be assigned to.
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* The lua 'pdf' table could not be assigned to.
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* The lua 'md5' library was returning incorrect results on
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* Luatex now compiles on GNU Hurd systems.
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* Fix segfault when embedding stream file object (these
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backend segfaults were a side-effect of the string pool
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The archives can be downloaded from supelec as usual:
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http://foundry.supelec.fr/gf/project/luatex/
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You could also check out the sources via anonymous svn:
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svn co http://foundry.supelec.fr/svn/luatex/tags/beta-0.50.0
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Bugs and feature requests can be added to the issue tracker at
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http://tracker.luatex.org