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. 

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.'

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.

RichTextBox: Doesn't display a portion of the text when the FlowMode is set to Flow

RichTextBox: HtmlFormatProvider: ListItems styles are changed in RichTextBox when Exported to HTML

Tables are exported with the wrong cell height to HTML.

Initial content in content controls is recognized as a placeholder. This is easily visible in the Date Picker content control and results in the whole text being selected when the user clicks over the date value.

When exporting to HTML of a DOCX file, containing table cells, which span multiple GridColumn wide, their width is incorrectly calculated. This can lead to columns being smaller or larger than their original width and possibly being cut off from the page.

Italic font style and bold font weight are not rendered correctly with a specific font. Currently, this is reproducible with the "zurich-ltcn-bt-light" font.

A complex table with merged cells cannot be imported. The table contains rows with no cells because of the merge.