When replacing a string within a run that is not the first element in the paragraph an unexpected behavior occurs.

These are the known cases:

• System.ArgumentOutOfRangeException: 'Index and length must refer to a location within the string. Parameter name: length'
• System.InvalidCastException: 'Unable to cast object of type <<type>> to type 'Telerik.Windows.Documents.Flow.Model.Run'.'
• Shifted text.

To reproduce: 

Introduce an option to replace a Run text with line breaks and/or new lines or with other document elements such as Table, Image, Paragraph and etc. 

The following code snippet shows how a Run can be replaced with another inline element:

RadFlowDocument document = new RadFlowDocument();
RadFlowDocumentEditor editor = new RadFlowDocumentEditor(document);
 
editor.InsertText("text");
editor.InsertText("REMOVE");
editor.InsertText("text");
 
foreach (Run run in document.EnumerateChildrenOfType<Run>().ToList())
{
    if (run.Text == "REMOVE")
    {
        Paragraph paragraph = run.Paragraph;
        int childIndex = paragraph.Inlines.IndexOf(run);
 
        ImageInline image = new ImageInline(document);
        using (Stream stream = File.OpenRead("example_image.png"))
        {
            image.Image.ImageSource = new Telerik.Windows.Documents.Media.ImageSource(stream, "png");
        }
 
        paragraph.Inlines.Insert(childIndex, image);
        paragraph.Inlines.Remove(run);
    }
}

When exporting merged documents when they are imported with ImportSettings set to ReadOnDemand an exception is thrown: KeyNotFoundException: 'The given key was not present in the dictionary.'

ArgumentOutOfRangeException is thrown when importing a document because of wrongly parsing to Unicode mapping.

System.ArgumentOutOfRangeException: 'Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index'

Add support for import and export of floating tables.

Exporting sheet properties corrupts the file and it cannot be opened in Excel.

In the latest version we export: 

<sheetPr>
<pageSetUpPr fitToPage="true" />
<tabColor rgb="FF92D050" />
</sheetPr>

Excel cannot read this and tries to recover the file unsuccessfully. This works in R3 2020.