I noticed that the width at which truncation occurs causes display oddness
where the "remove workspace" text is somewhat longer than the truncated text.
Also, it doesn't properly cope with UTF-8 because it assumes that one character
== one byte.

I noticed a question about why the active window isn't highlighted (in #xine)
and decided to have a look... this is a trivial enhancement and is most easily
done at the same time.

NOTE: see also bug 2126 (for the window list panel plugin).