user32: Resend: Check the instance id on DdeCreateDataHandle and retire a couple of todos

[Jeff Latimer]

This patch checks for a invalid instance Id and then set all lastError 
fields for all instances in the same thread.  The tests included 
demonstrate that both instances have their lastError set.
---
  dlls/user32/dde_misc.c  |   30 +++++++++++++++++++++++++++++-
  dlls/user32/tests/dde.c |   30 ++++++++++++++++++++++--------
  2 files changed, 51 insertions(+), 9 deletions(-)


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