gdi32: Improve calculation of the character code text metrics.

[Huw Davies]

---
 dlls/gdi32/font.c       |   14 ++-
 dlls/gdi32/freetype.c   |   20 ++-
 dlls/gdi32/tests/font.c |  319 ++++++++++++++++++++++++++++++++++++++---------
 3 files changed, 279 insertions(+), 74 deletions(-)
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