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The implementation of pango_MeasureCharacterRanges() passes incorrect index values to pango_layout_index_to_pos(). This results in string width measurements being incorrect (usually too narrow). I have a fix which I'll post shortly as a pull request.
The index values currently used are into the UCS-2 string, but the documentation clearly indicates that they should be indexes into the UTF-8 string.
A proposed fix has been submitted as https://github.com/mono/libgdiplus/pull/29