When the wrap option is set, a long line is wrapped as expected if and only if it contains spaces.
If the typed line does not contain space characters (i.e. the line is a single and very long token) then it is not wrapped (i.e. it is necessary to use the horizontal scroller to see the tail of the line). Cheching and editing such a line without visual wrapping is awkward when the line is very long, e.g. the value of a PATH variable in a .chsrc file.

Is there any way to wrap the lines even if they don't contain spaces?

Thanks for your help!