bug#66062: Underscores in Latex Style Files using L3 Programming Layer

[Heime]

In LaTeX3's L3 Programming Layer, which is the low-level programming interface 
for LaTeX3, 
underscores (_) are treated as normal characters.  Unlike in LaTeX2e, where 
underscores are
used to denote subscripts in math mode.  LaTeX3's L3 Programming Layer allows 
underscores 
to be used freely in variable and function names without any special treatment.

But Emacs is treating my L3 Style variable and function with subscripts when 
underscores
are encountered.  Latex Mode set the text within the subscript part with a 
lowered height,
making the L3 Style Files look extremely messed up.