The microtype package

IMPLEMENTATION: Font setup 74\MT@afteraftergroup\MT@get@tr@opt\MT@tr@unit@\MT@tr@ispace\MT@tr@ospace\MT@tr@okern\MT@tr@ligatures\MT@get@tr@opt@\MT@set@lsfontfont.1787 \MT@protrusionfalse1788 }%1789 }This helper macro carries stuff outside of the current group to the end of the nextgroup, but will then respect grouping, which is crucial for nested letterspacing.(Following an idea of Will Robertson.)1790 \def\MT@afteraftergroup#1{%1791 \MT@ifdefined@n@TF{MT@aftergroup@\number\currentgrouplevel}\relax{%1792 \MT@exp@cs\xdef{MT@aftergroup@\number\currentgrouplevel}%1793 {\MT@exp@cs\MT@glet{MT@aftergroup@\number\currentgrouplevel}\noexpand\@undefined#1}%1794 \expandafter\aftergroup\expandafter\aftergroup\MT@exp@cs\aftergroup1795 {MT@aftergroup@\number\currentgrouplevel}%1796 }%1797 }1798 Various settings (only for the microtype version).1799 1800 \def\MT@get@tr@opt{%1801 \MT@set@listname1802 \MT@ifdefined@n@T{MT@tr@c@\MT@tr@c@name}{%1803 \MT@let@cn\MT@letterspace{MT@tr@c@\MT@tr@c@name}%Different unit?1804 \MT@ifdefined@n@T{MT@tr@c@\MT@tr@c@name @unit}{%1805 \MT@let@cn\MT@tr@unit@{MT@tr@c@\MT@tr@c@name @unit}%1806 \ifdim\MT@tr@unit@=1em1807 \let\MT@tr@unit@\@undefined1808 \else1809 \MT@let@cn\@tempb{MT@tr@c@\MT@tr@c@name}%1810 \MT@get@unit\MT@tr@unit@1811 \let\MT@tr@factor@\@m1812 \MT@scale@to@em1813 \edef\MT@letterspace{\number\@tempcntb}%1814 \fi1815 }%1816 }%Adjust interword spacing.1817 \MT@get@tr@opt@{spacing} {ispace}%1818 \MT@get@tr@opt@{outerspacing}{ospace}%Adjust outer kerning.1819 \MT@get@tr@opt@{outerkerning}{okern}%Which ligatures should we disable (empty means all, undefined none)?1820 \MT@get@tr@opt@{noligatures} {ligatures}%1821 }1822 \def\MT@get@tr@opt@#1#2{%1823 \MT@ifdefined@n@T{MT@tr@c@\MT@tr@c@name @#1}%1824 {\MT@let@nn{MT@tr@#2}{MT@tr@c@\MT@tr@c@name @#1}}%1825 }1826 Redefine \font@name, which will be called a second later (in \selectfont).1827 1828 \MT@requires@latex2{1829 \def\MT@set@lsfont{\MT@exp@two@c\let\font@name\MT@lsfont}