Avoid unnecessarily breaking inside words when using continued

`continued` is implemented by temporarily shortening the lineWidth,
which can cause the linewrapper to break inside words when that's not
really necessary.

lib/line_wrapper.coffee

@@ -64,7 +64,7 @@ class LineWrapper extends EventEmitter
       
       # if the word is longer than the whole line, chop it up
       # TODO: break by grapheme clusters, not JS string characters
-      if w > @lineWidth
+      if w > @lineWidth + @continuedX
         # make some fake break objects
         lbk = last
         fbk = {}