master
[eqn]: Regression-test Savannah #68468.
[build]: Add/update .gitignore files.
Use "e.g." correctly in documentation, comments.
[eqn]: Emit better-formed XHTML/MathML. (1/3)
[eqn]: Tweak authorial notices.
eqn: Fix undefined behaviour, part 1.
eqn(1): Apply poor man's keep.
src/preproc/eqn/eqn.am: Annotate sed hazard.
[eqn]: Add `lex_warning()` function.
eqn: Fix undefined behaviour, part 2.
[eqn]: Fix code style nit. (1/2)
eqn(1): Add "Environment" section.
Fix Savannah #68212.
src/preproc/eqn/text.cpp: Fix code style nits.