shlwapi: Test and fix the behaviour of the CopyTo method for file sizes not multiple of the internal buffer size, on SHCreateStreamOnFileEx-returned IStreams. (try 7)

[David Quintana (gigaherz)]

I asked a friend to review the patch, and he suggested some improvements.

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 dlls/shlwapi/istream.c       | 14 +++++------
 dlls/shlwapi/tests/istream.c | 56 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 7 deletions(-)
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