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--- tabu.sty.old	2019-01-14 17:10:48.000000000 -0500
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+++ tabu.sty	2019-12-11 09:16:55.745034664 -0500
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@@ -52,12 +52,12 @@
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 %% lppl copyright 2010-2011 by FC <florent.chervet@free.fr>
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 %%
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 %% Updated 2019-01-11
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-%% Copyright 2019 tabu-fixed github group (LaTeX3 Project members)
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-%% Please report any issues at https://github.com/tabu-fixed/tabu
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+%% Copyright 2019 tabu-issues-for-future-maintainer github group (LaTeX3 Project members)
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+%% Please report any issues at https://github.com/tabu-issues-for-future-maintainer/tabu
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 %% 
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 \NeedsTeXFormat{LaTeX2e}
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-\ProvidesPackage{tabu}[2019/01/11 v2.9 - flexible LaTeX tabulars (FC+tabu-fixed)]
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+\ProvidesPackage{tabu}[2019/01/11 v2.9 - flexible LaTeX tabulars (FC+tabu-issues-for-future-maintainer) + intermediate FMi]
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 \RequirePackage{array}[2008/09/09]
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 \RequirePackage{varwidth}[2009/03/30]
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 \AtEndOfPackage{\tabu@AtEnd \let\tabu@AtEnd \@undefined}
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@@ -727,6 +727,10 @@
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                       \tabu@currentgrouptype\expandafter{\the\currentgrouptype}}%
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 \fi
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 }% \tabu@init
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+%%TABU-FIXED set up \tabu@currentgrouptype
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+%FMi cancel for nested arrays ...
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+\def\@tabarray{\m@th\def\tabu@currentgrouptype{\currentgrouptype}\@ifnextchar[\@array{\@array[c]}}
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+
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 \def\tabu@indent{% correction for indentation
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     \ifdim \parindent>\z@\ifx \linewidth\tabudefaulttarget
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     \everypar\expandafter{%
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@@ -1663,6 +1667,9 @@
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         \ifdim \tabu@temp\p@>\z@ \ifdim \tabu@temp\tabucolX<\tabu@target
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                                         \tabu@target=\tabu@temp\tabucolX \fi\fi
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         \setbox\tabu@box  \hbox \bgroup
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+%%TABU-FIXED add \color@begingroup
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+%%FMi not yet understood why this one is also needed ...
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+    \color@begingroup
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             \begin{varwidth}\tabu@target
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                 \let\FV@ListProcessLine \tabu@FV@ListProcessLine  % \hbox to natural width...
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                 \narrowragged \arraybackslash \parfillskip \@flushglue