Re: Line wrap reconsidered

[Stefan Monnier <monnier@iro.umontreal.ca>]

> I’ve implemented and used a lisp-based line-wrapping feature for a while and
> it’s still sub-optimal for me. I now want to try to explore if I can add it
> directly to redisplay. 
>
> Here is what I come up with: in redisplay code, instead of only checking for
> whitespace, check for a ‘no-wrap text-property, if the character has this
> property, don’t wrap before[1] this character (or maybe it can be the
> opposite, only wrap when the character has a ‘can-wrap property). And this
> text property is calculated and applied once. 

I don't think I can discuss the quality of this proposal without first
understanding the intended use cases (including who/how/when the
property would be added).

> Could this be plausible? Is checking text property is fast enough for redisplay?

I'll let Eli answer this part (I vaguely remember that it could be
somewhat costly, but it likely depends on the details).

> [1] There are some complications to this, some characters can’t have line
> break before them, some can’t have after; maybe  use ‘before, ‘after and nil
> instead of binary value.

Hence the need to clarify the intended use case.


        Stefan