Quote:
Originally Posted by Tanzaku
Yes, you are right, it does. In fact, that's the exact pattern for GREP or basic TEXT replacements. The draft document we posted has already had the single word "I[space]" replaced with "I[nonbreaking space]" to illustrate the point. We simply haven't yet run the rest of the bad-boy offenders through their paces yet. 
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As long as the non-breaking space stretches as shrinks in the same way as an ordinary spaces does, fine. If it doesn't, the text will look weird.
In english typography, I can't ever remember seeing a rule against leaving a single-character word (I or a) at the end of the line. Where does that come from?