When users select a value and perform undo on that selection, then the same value cannot be selected again. Another value should be selected.

The "forms" restriction mode is not respected in RadRichTextBox. In Word, you can allow the user to edit the content controls only and this is not respected in RadRichTextBox.

The editor used for the footnotes causes ArgumentNullException when trying to pass the dialog to it.

When users insert a Content Control to the document, save the document as XAML, and reload it, the content control cannot be edited.

Importing document with content controls inside a TableCell leaves only the content 

When the image is at the right-most side of the page and has text appended just before it, adding caption results in splitting the content prior to the image. The last symbol of the content appears after the caption. The issue is reproduced sporadically.

The Mentions popup is not shown when the cursor is in the last line and the line is at the down edge of the control. Gif is attached. 

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.

Selecting the same date after Undo operation in Date content control does not select the date.

RichTextBox: When the control height is set to a single line the caret is in the wrong position after the app started.

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

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+.').

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.

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