Posted 11 Nov 2008
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No clue on an updated manual, but... The constrain works to adjust the height and width proportionally, as it should. When you right click to open the image, it is treated as if it is the first time you are opening the image, so whether or not you constrained on a previous instance of editing the image has no effect on it. Think of it like this... you have a picture on your desktop. You pop it open in PhotoShop or Paint.Net (if you're poor like me :D), resize it, save it, and close the program. Next time you right click to open it, you're opening it as a fresh copy, regardless of how many times you edited it previously. ImageManager works kinda like that. :)
As far as working with the constrain, as long as the lock is on, when you edit width the height should adjust automagically, or vise-versa.