[BUG] Passing special characters to &listchars and &fillchars causes screen corruption

[ZyX]

Consider the following code:

    vim -u NONE -c $'set list lcs=nbsp:\x0D' \
                -c $'normal! i\u00A0\u00A0\u00A0a\e'

You will see cursor placed on the second virtual `M' (from `^M'), but `ga' will 
show that you are on the letter `a'. Passing special characters to `tab' 
suboption causes more corruption, but is less reproducible. With fillchars 
results are better: highlighting partially disappears, but that's all (tested 
only with vert and stl).

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