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U+0308 (combining diaeresis) doesn't display as expected 


public void ConvertToPdf(Stream targetStream)
{
    // Set the conformance for PDF/A-1a conversion.
using var render = new DocIORenderer
    {
        Settings = {PdfConformanceLevel = PdfConformanceLevel.Pdf_A1A, EmbedCompleteFonts = true, AutoTag = true, OptimizeIdenticalImages = true}
    };
    //render.Settings.ChartRenderingOptions.ImageFormat = ExportImageFormat.Jpeg;

using var pdfDocument = render.ConvertToPDF(Document as WordDocument);
    pdfDocument.Save(targetStream);
}


The tool can't handle unicode symbols where they modify the previous character, specifically I noticed this with the below variants:


  1. U+00E4 ä LATIN SMALL LETTER A WITH DIAERESIS
  2. U+0308 ◌̈ COMBINING DIAERESIS

The first type works perfectly, but the second, where we add the diaeresis after the letter a doesn't. It either is invisible, or only displays an "a" without the diaeresis.