Wrapping in listener doesn't always update

[gz]

In a new listener, do (apropos "bitmap"). This results in some long lines, which are properly wrapped to window size. Resize the window to be wider. The display recomputes correctly (i.e. changes to wrap lines at new end of window). Now make the window narrower again. The lines don't rewrap -- they stay wrapped at the width of the former window width, and the horizontal scroll bar becomes enabled, so you end up with a weird mixture of scrolling and wrapping. (It actually took me a while to figure out that's what was going on, it felt like the listener output was just totally screwed up).

[rme]

Fixed in r7603.