I don't know whether this is particular to 1.0.0pre8, but I just replaced
a space with a hard space, and this caused a word to be pulled back from
the next line to the current one. I then went down to the next line, and
came back up by moving the cursor left; when I had moved a little way
along the original line the word was pushed back on to the next line.
Experiments showed this to be repeatable and that the linespacing was
changed when I moved into a math box.
--
http://www.cl.cam.ac.uk/users/rrt1001/ | maxim, n. wisdom for fools