mathml/luamml-patches-amsmath.sty

\ProvidesExplPackage {luamml-patches-amsmath} {2021-04-23} {0.0.1-alpha}
  {Feel free to add a description here}

\lua_now:n { require'luamml-amsmath' }

\cs_set:Npn \align@preamble {
  &
    \hfil
    \strut@
    \setboxz@h {
      \@lign
      $
        \m@th
        \displaystyle {
          ##
        }
        \ifmeasuring@
          \luamml_flag_ignore:
        \else
          \luamml_flag_save:
        \fi
      $
    }
    \ifmeasuring@
      \savefieldlength@
    \else
      \__luamml_amsmath_add_box_to_row:
    \fi
    \set@field
    \tabskip\z@skip
  &
    \setboxz@h {
      \@lign
      $
      \m@th
      \displaystyle
      {
        {}
        ##
      }
      \ifmeasuring@
        \luamml_flag_ignore:
      \else
        \luamml_flag_save:
      \fi
      $
    }
    \ifmeasuring@
      \savefieldlength@
    \else
      \__luamml_amsmath_add_box_to_row:
    \fi
    \set@field
    \hfil
    \tabskip\alignsep@
}

\cs_set:Npn \math@cr@@@align {
  \ifst@rred
    \nonumber
  \fi
  \if@eqnsw
    \global \tag@true
  \fi
  \global \advance \row@ \@ne
  \add@amps \maxfields@
  \omit
  \kern -\alignsep@
  \iftag@
    \setboxz@h { 
      \@lign
      \strut@
      { \make@display@tag }
    }
    \place@tag
    \__luamml_amsmath_set_tag:
  \fi
  \ifst@rred
  \else
    \global \@eqnswtrue
  \fi
  \global \lineht@ \z@
  \cr
}

\cs_set:Npn \maketag@@@ #1 {
  \hbox {
    \m@th
    \normalfont
    #1
    \__luamml_amsmath_save_tag:
  }
}

\cs_set:Npn \endalign {
  \math@cr
  \black@ \totwidth@
  \__luamml_amsmath_finalize_table:
  \egroup
  \ifingather@
    \restorealignstate@
    \egroup
    \nonumber
    \ifnum0=‘{\fi\iffalse}\fi
  \else
    $$
  \fi
  \ignorespacesafterend
}

\cs_set:Npn \bBigg@ #1 #2 {
  {
    \ensuremath {
      \Uvextensible height~#1 \big@size axis~exact~#2
    }
  }
}