edit: add some tests for EM_CHARFROMPOS and EM_POSFROMCHAR

[Lauri Tulmin]

changelog:
- EM_CHARFROMPOS should return the closest char (clicking on the first
half of a character should return current char and clicking on the
second half should return next char)
- EM_POSFROMCHAR should return -1 if character index is greater or
equal to text length
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