I got a little off track today, rather than looking at stuff on the version 4 list, I fixed up some folding and scrolling stuff... now the editor doesn't fold away the cursor during a fold all. when fold all is performed, the cursor line is moved to the top line of the editor. when Unfoldall is performed the cursor stays at the current position (was getting lost before).
Also, now you can only hori-scroll the size of the longest line (plus a little bit of buffer), and horizontal scrolling via mousewheel was fixed on mac.
Ohh yeah, margins are a solid colour on mac now... rather than those nasty lines.