On 21/04/11 20:04, William Adams wrote:
> Where the space is _absolutely_ invariant regardless of the spacing
> of the text line --- has anyone ever seen that in a style guide?
> Got a customer demanding it, and trying to understand why they'd feel
> such a thing was necessary or to be preferred.

Presumably they want to allow a linebreak after the dash when necessary?

On 21/04/11 20:58, Michael Brady wrote:
> That looks like a British preference.

I think so. I prefer it with spaces, but a lot depends on how long the
em or en dash is in any given face.