Fix rounding issue in SPositionFromLocation() that started with introduction of fractional positioning. Bug #3485669.
Fix rounding issue in SPositionFromLocation() that started with introduction of
fractional positioning. Bug #3485669.

R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone,R1dO/scintilla_clone