Link: https://code.launchpad.net/~edb/quam-plures/excerpt_more_bug
If you change your main page list display to excerpt and create a post too short to actually need an excerpt then you will always get the "read more" link, even when you are on the permalink page and are already reading the entire (short) item. This branch solves that.
UPDATE: branch merged into core on 2011-02-11. Impeccable!
