In acme, when I need to do a find and replace with confirmation on each change I typically use the technique that rsc suggested here
http://9fans.net/archive/2008/08/134 (a great read even if you don't care about find and replace). It works pretty well, but it doesn't show me the change, as the thread says it will; I have to scroll down to find it, or press the left or right key to show the cursor. Was this behavior changed at some point, or am I just doing something wrong?