* Python
** Fix builtin/keyword fontification for Python 3
E.g. =print= became a builtin.
*** TODO add fontification tests
*** TODO have dedicated font-lock styles for Python 2, 3 and "mixed"
Default to "mixed" (rely on tests to ensure user-visible change).
**** TODO create font-lock styles
**** TODO create variable to choose style
Users could customize it or set it wiht directory-local variables.
*** TODO add heuristic to pick the "right" style
** Fontify f-strings
E.g. =f'an {expression} that should be highlighted'=.


* Shell scripts
** Fix builtin/keyword fontification
- =continue= and =break= are /builtins/.
** Fontify variables within strings
E.g. ="an ${expression} that should be highlighted"=.
** Do not highlight single-quoted command substitutions
E.g. ='this $(call) should not be highlighted'=.
** Fix indentation on continuation lines
#+BEGIN_SRC shell
# cf
# - electric-indent-post-self-insert-function
# - indent-according-to-mode
# - indent-line-function => smie-indent-line
# - smie-indent-functions
# - smie-indent-exps
# => calls smie-backward-sexp, which does not skip over ${foo}
foobar \
    indentis4
foo_bar \
    indentisstill4
${foo}bar \
      indentisfoobar
#+END_SRC


* Makefile
** Recognize [[http://austingroupbugs.net/view.php?id=330][POSIX "immediate-expansion"]] operator ~::=~


* Assembly
** =C-o= inserts a tab despite =indent-tabs-mode= being nil
This seems to come from the mode setting =fill-prefix=.  The mode also
does not adhere to the "~RET~ = smart newline, ~C-j~ = dumb linefeed"
convention for no good reason AFAICT.


* TeX
** electric-pair-mode and $inline math$
e-p-m inserts a closing $ after point, but inserts a new pair instead
of overwriting when pressing $ again.
** AUCTeX
*** electric-pair-mode does not work
**** pressing ="= on active region does not surround it with quotes even with electric-pair-mode
TeX-insert-quote erases the region and inserts =``= instead.
**** pressing =$= inserts a single $