Re: antlr-mode.el - need some support by python.el

[Dmitry Gutov]

Anyway, if prog-indent-line calls `save-restriction' and `widen', the 
indent calculation functions won't have to, and we can disrecommend them 
doing that (and change the modes in Emacs not to do that).

Then multi-mode packages can use `narrow' to calculate indentation in 
submode regions without problem, as long as they know what to do about 
syntax-ppss cache.