With screen, in a terminal that's 80 columns wide, I can do something like:
for i in $(seq 81); do echo -n "m"; done; echo
and then resize the window to be a little wider, and the last 'm' jumps up to where it would have been had I run the command before resizing the window. I'm really loving tmux but am missing this lovely feature from screen... Is there any way to make tmux do this (some hidden recompute-width command I haven't found yet)?