gdi32: Avoid making a DBCS character in range. (try 3)

[Akihiro Sagawa]

Completely rewrite the logic when the lead byte character is found.
---
 dlls/gdi32/font.c       |   18 ++++++++++++++----
 dlls/gdi32/tests/font.c |   30 +++++++++++++++++++++++-------
 2 files changed, 37 insertions(+), 11 deletions(-)

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