think more carefully about text wrapping in nbconvert

[minrk]

1. we should never perform any transforms of any kind on raw cells, not even wrapping
2. colored output is wrapped based on the length including ANSI escapes, so they can end up as super short lines.

[jdfreder]

1. Doesn't wrapping have to be enforced some way or another? Otherwise output will overflow page boundaries.
2. I looked earlier and wasn't able to find a latex package to wrap content so it doesn't overflow the mdframed boxes without breaking the multi-page support. I think the best solution would involve measuring each line and breaking once the contents of the line reached the border of the mdframed box.

Thoughts?

[minrk]

Doesn't wrapping have to be enforced some way or another? Otherwise output will overflow page boundaries.

This doesn't apply to raw cells - remember, raw cells are raw latex input, the entire point of which is that we don't touch them, no matter what.

For colored output, we are clearly doing the wrapping wrong, because we are measuring color escapes as part of the column width, so we are effectively wrapping at about 20 characters.

I didn't say we shouldn't wrap, just that we should never wrap raw cells (obvious) and we should be more careful about what we measure for text output, since we are currently measuring incorrectly.

[minrk]

I think we only wrap input code now, which I think is close enough.