The server won't actually send the event until the request is done.

This matches what WineEngCreateFontInstance() does, and makes applications
which set custom axes directions using different window/viewport extents
display text correctly.

As Eric Anholt pointed out, using length() here is suboptimal. It essentially
translates into "inversesqrt(dot(x, x));", but needs to handle the case of
zero-length vectors, much like nrm.

This is mostly for consistency, in practice ddraw code is never going to use
this format.