Copying content controls using DocumentFragment and then inserting them causes several undesired behaviors.

For example, if the original content control is in "Placeholder mode" (meaning the initial pre-generated text is intact), after the copy operation, its content is treated as user inserted and it is not fully selected on entering the control. Another issue is with Plain Text/Date Picket/Repeating Section control - after the copy, their Properties dialog cannot be shown.

 The AddParagraphToSelection method adds the first row of a table when it is the element after the paragraph. 

To workaround this manually select the paragraph:

var para = caret.GetCurrentParagraph();
DocumentPosition pos = new DocumentPosition(doc);
pos.MoveToDocumentElementStart(para);
selection.AddSelectionStart(pos); 
pos.MoveToDocumentElementEnd(para); 
selection.AddSelectionEnd(pos);

 this.radRichTextBox.Delete(false);

DeleteAnnotationRange fails to execute when the content is uneditable annotation. For example: PermissionRange with a checkbox content control inside.

A possible workaround would be to manually delete the annotation range from the document element tree:

var rangeEnd = rangeStart.End;
var endParent = rangeEnd.Parent;
if (endParent != null)
{
    endParent.Children.Remove(rangeEnd);
}

var parent = rangeStart.Parent;
if (parent != null)
{
    parent.Children.Remove(rangeStart);
}

this.radRichTextBox.UpdateEditorLayout();

1 Open RadRichTextBox and press Windows + . to to show the emoji box. 

2 Choose the emoji and press backspace to remove it.

Actual behavior: When you press the backspace to remove the emoji, a square is left

Expected behavior: When you press the backspace the emoji should be deleted.

FloatingUIContainers are not cleared from the UI when they are deleted.

Workaround: Recreate UI using the following code:
this.radRichTextBox.ActiveEditorPresenter.RecreateUI();

Inserting a single-cell table with top border is a common workaround for the missing 'horizontal line' functionality. 

Exporting such table to PDF causes wrong result if the intercepting vertical borders are of type None and have smaller thickness.

Attached image outlines the issue.

Workaround: Set the same thickness to the noBorder and to the visible border:
var t = new Telerik.Windows.Documents.Model.Table(1, 1);\
var noBorder = new Telerik.Windows.Documents.Model.Border(3, BorderStyle.None, Colors.Black);
t.Borders = new TableBorders(noBorder, new Telerik.Windows.Documents.Model.Border(3, BorderStyle.Single, Colors.Black), noBorder, noBorder);


Steps to reproduce:
1. Insert table with the following code:

            var t = new Telerik.Windows.Documents.Model.Table(1, 1);
            var noBorder = new Telerik.Windows.Documents.Model.Border(BorderStyle.None);
            t.Borders = new TableBorders(noBorder, new Telerik.Windows.Documents.Model.Border(3, BorderStyle.Single, Colors.Black), noBorder, noBorder);

            this.radRichTextBox.InsertTable(t);
2. Export to PDF

Pressing Enter in the first empty cell in the second table of two adjoined tables adds the paragraph between the tables. Instead, the paragraph should be added in the cell.

Steps to reproduce:
- Add two tables.
- Remove the paragraph between them (using the Delete key).
- Add paragraph in the first cell of the second table.
Expected: The paragraph is added in the cell.
Actual: The tables are separated by paragraph.

The flow direction of a paragraph is automatically changed to right-to-left if all spans in the paragraph are in the right-to-left mode when importing from DOCX format.