Substitution with special characters does not get copied correctly

[svermeulen]

Repro steps:

1. Enter the following: foo ^G<cr>bar. Should display as foo ^Mbar.
2. Copy it to clipboard with yy
3. Paste it with p
4. Should paste properly as foo ^Mbar
5. Try it with substitution operation by executing sj (assuming default mapping)
6. Notice it displays as:

foo
bar

[svermeulen]

This occurs because it uses the change operation in combination with enabling paste mode to do the substitution. This is nice because it handles edges cases like end of line, end of file, etc. better. But given this problem, we might have to change it to use p instead and then just add special case behaviour for all the edge cases. This problem would be especially bad when doing things like copying the entire contents of the buffer and then replacing another buffer.