RichTextBox: Exception when loading a table with a specific layout in R2 2022

This works with R1 2022 SP1

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 layout hangs when importing HTML with nested tables and setting the padding of all cells

No visual cue when image deleted or inserted when "Track changes" is activated. 

When inserting an image with the Track Changes option toggled, the image should be underlined with red and it isn't. When deleting an image with Track Changes on, it is also not crossed with red. In both cases, the only mark that a change was made is the vertical line on the left.

Replacing a piece of text through find/replace dialog causes intersecting insert/delete ranges. 

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+.').

Implement the export of notes (footnote, endnote) in the PdfFormatProvider of the RadRichTextBox.

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 \sl (line spacing) RTF tag is supposed to be accompanied by a number indicating the value of the line spacing. According to the RTF specification: 

Space between lines. If this control word is missing or if \sl0 is used, the line spacing is automatically determined by the tallest character in the line. If N is a positive value, this size is used only if it is taller than the tallest character (otherwise, the tallest character is used); if N is a negative value, the absolute value of N is used, even if it is shorter than the tallest character. 


However, there are documents where the number is missing at all and MS Word interprets those as if the value is 0. RadRichTextBox visualizes these with lines of size close to zero which makes them invisible. Although this case is not mentioned in the specification, we can consider fixing it.

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

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.'