riched20: Add some test for EM_GETTEXTLENGTHEX and fix the single line edit cases.

[Huw Davies]

---
 dlls/riched20/caret.c        |    4 +-
 dlls/riched20/tests/editor.c |   67 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+), 2 deletions(-)
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