When importing a document with a content control present inside the header/footer, only the content remains and the control itself gets stripped.

When in Header/Footer mode trying to insert a content control causes it to be added inside the main document.

The document can be properly visualized in MS Word and RadRichTextBox but upon opening it with WordPad, the image is not visible. Trying to create a FlowDocument object from it leads to an exception (System.Runtime.InteropServices.ExternalException: 'A generic error occurred in GDI+.').

The error is thrown while measuring a nested table and one of its rows is separated on different pages. 

CopyPropertiesFromOverride() method of InlineUIContainer is called more than once for every Copy/Paste command.

When there is a table and a paragraph in the header, the added watermark appears multiple times.

The HighlightColor of spaces at the end of the line is not correct when the FlowNoWrap mode is used.

The cursor jumps to the next line sometimes when clicked at the end of the line.

Unable to place the cursor before a single vertical line character at the start of the line (ex. "I", "i", "l").

RIchTextBox: Changing the current value of ComboBox/DropDownList/DatePicker/CheckBox content control causes two items to appear in the undo stack - Delete and Insert.

User is able to type in a content control even though its editing is not allowed by setting the "Content control cannot be edited" option.

Setting "Content control cannot be deleted" for a Plain Text content control breaks the editing rule and the user cannot edit the Plain Text control.

The default combo box item is restored when on exports content controls to xaml and then imports back

The PlaceholderText of Content Control should be restored when the content is deleted and the icon is clicked. 

When committing the text, the automatic underline should be removed from the content. However, it is preserved for all spans inserted with the IME.

Currently, the uncommitted text is always underlined with a dotted line. Provide an option for disabling that behavior.

When importing a XAML document that contains a Content control with PrefixMappings to its TextProperties` DataBinding an exception is thrown: 'Telerik.Windows.Documents.Model.StructuredDocumentTags.DataBinding.PrefixMappings' threw an exception.'

The issue is hard to reproduce as it seems to depend on a specific combination between a resolution and text scaling.

RichTextBox: Exporting hyperlinks that include symbols such as a Section sign (§) to a PDF file breaks the link

To reproduce:

1. Insert content spanning 3 pages
2. Ensure a single page is visualized in the viewport 
3. Start selecting from the beginning of the content till the end by dragging the mouse
4. Press Delete

The issue is a regression introduced in R3 2021 SP1.