cosmetical - displaying lines exactly one window wide

[Stanislav Brabec]

Emacs 21.1:

This cosmetical improvement can be applied on windowed Emacs, when line
is exactly window width long.

Currently Emacs displays whole data line on line 1, on sidebar it
displays continuation mark, next line start with continuation mark, but
is empty.

More logical is display whole data line on line 1, on sidebarnot to
display continuation mark and next line will display next line of data.

I expect it is simply repeatable on any environment.

-- 
Stanislav Brabec
http://www.penguin.cz/~utx/index