msctf/tests: Fix failures on Win7 and East-Asian machines

[Greg Geldorp]

Most of the failures were due to Win7 firing multiple OnSetFocus events
while the tests only expected a single event. E.g. the test might expect a
single event with prev focus A and current focus B, where Win7 will fire
two events, first A -> NULL and then NULL -> B. This is handled by
collecting the events via SINK_SAVE and then checking the expected
prev/current after the function that caused the focus change completes.
There are also different behaviors depending on whether the test
executable runs in the foreground or not.

---
 dlls/msctf/tests/inputprocessor.c |  115
+++++++++++++++++++++++++++++-------
 1 files changed, 92 insertions(+), 23 deletions(-)



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