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Created attachment 25921 [details]
example code to reproduce the problem
StringFormatFlags.MeasureTrailingSpaces flag is not added during text rendering
and the same for
Russian letter 'Р' have code 0x0420 (you see - it ends with 0x20 byte).
This code fragment remove part of this letter -
what results is wrong calculation of text length, and wrong rendering of text and cursor position.
Created attachment 25922 [details]
Patch for libgdiplus