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

[Dmitry Gutov]

On 02/19/2015 05:20 AM, Stefan Monnier wrote:

> I can't give you such a situation off-hand, but I've seen plenty of
> problems when executing innocent code in a narrowed buffer.
> I've gone and rewrote all kinds of codes (e.g. filling) to avoid using
> narrowing specifically for that reason.

I've also seen problems with narrowing, but maybe classfying them and 
adding some rules would turn out a useful result.

> > > E.g. in latex-mode, a "\begin{verbatim}" has to go to column 0, no
> > > matter what the context.
> > Are there important cases like this where we can't "flip" the modes and
> > consider latex the "primary" mode instead?
>
> All this just to avoid passing LEFTMOST-COL?

Not really. The leftmost-col avoidance scheme I described further on 
would deal with latex as submode just fine.

Rather, it's a general observation: flipping the modes can simplify 
things. For instance, whenever we talk about indentation in a submode 
being dependent on the previous chunks of that submode, but not the 
primary mode contents between then, it sounds like the roles should be 
reversed.