For a while, I was building prerelease versions of 24.4. One of the features that I liked was that when I used
string-rectangle (via C-x r t), the string that I was typing showed up live in the buffer. This let me see what I was changing in context.
However, when I upgraded to the release version of 24.4, that functionality disappeared. I gave a quick look at
rect.el, but I didn't see any appropriate variables that might help. Is there a way of enabling this feature again?