Buggy display of non-breaking space character in several single-byte encodings

I've noticed that Vim displays the "NO-BREAK SPACE" character (Unicode
00A0) incorrectly for several single-byte encodings (e.g., cp437, cp850
and cp775), which typically encode it as 0xFF.

To reproduce...
:set enc=cp850
Enter the following 2 lines in an empty buffer...
<ff>2345
12345
...where <ff> represents the character at code point 0xff, entered with
CTRL-V.

The non-breaking space is displayed normally (like a regular space
character) until the cursor is moved onto it, whereupon the cursor
becomes 4 characters wide, covering (and effectively erasing) all but
the "5" on the first row. The covered characters are not redrawn when
the cursor is moved down a row with j. If you then use CTRL-L to redraw,
the covered characters are redrawn, but shifted rightward from their
original location. Move the cursor back up to the line with the
non-breaking space, then move it left and right, and you'll see the
characters redrawn in the 2 different spots, sometimes simultaneously.

Sincerely,
Brett Stahlman

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