Moving caret back/forward to previous/next editing position within a document in Xcode 4?
The shortcut in XCode 4 for "Go forward/backward" is "Control" + "Command" + "Arrow"
This is super annoying for me. When I tried to change the shortcut in the Shortcut Editor back to the Xcode 3 way, Xcode crashes. Fun.
Another option for switching to Previous/Next editing position (Go Back/Go Forward) is using two finger swipe (left for Go Back, right for Go Forward). I realize that this is not a keyboard shortcut but if you are using a Trackpad, it is much faster than trying to click on the buttons.
Note: The pointer does need to be in the editor for swiping to work.
Not 100% sure what you mean by "previous editing point", but Command+Option+Left|Right is code folding. I use Option+Left|Right and Control+Left|Right to move back and forth within the code to get to particular points.
A list of Xcode keyboard shortcuts can be found here