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.

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

IME: Cannot type in RadRichTextBox using Microsoft Pinyin Input Method (Chinese)

The exception is thrown with a message "Item has already been added. Key in dictionary: 'RepeatButtonLineUpTemplate'" and it is caused by a duplicate style definition. 

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.

Typing in Korean repeats symbols at the end. This breaks the input and the user is unable to enter the text desired.

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.

Working with PasteOptionsPopup may cause an exception in LayoutElement.SetParent. Very difficult to reproduce, having no consistent steps. Maybe it is related to undo of paste command, but there are no other clues aside from this.

   bei Telerik.Windows.Documents.Layout.LayoutElement.SetParent(LayoutElement newParent)
   bei Telerik.Windows.Documents.Layout.LayoutBox.EnsureParent()
   bei Telerik.Windows.Documents.Layout.LayoutBox.get_Parent()
   bei Telerik.Windows.Documents.Layout.FormattingSymbolLayoutBox.get_IsEndOfCell()
   bei Telerik.Windows.Documents.Layout.FormattingSymbolLayoutBox.GetFormattingSymbolVisual()
   bei Telerik.Windows.Documents.Layout.FormattingSymbolLayoutBox.get_Text()
   bei Telerik.Windows.Documents.SpanBoxPositionHandler.get_Location()
   bei Telerik.Windows.Documents.UI.DocumentWebLayoutPresenter.GetViewPointFromDocumentPosition(DocumentPosition position)
   bei Telerik.Windows.Controls.RichTextBoxUI.PasteOptionsPopup.CalculateLocation()
   bei Telerik.Windows.Controls.RichTextBoxUI.PasteOptionsPopup.OnOwnerLayoutUpdated(Object sender, EventArgs e)
   bei System.Windows.ContextLayoutManager.fireLayoutUpdateEvent()
   bei System.Windows.ContextLayoutManager.UpdateLayout()
   bei System.Windows.UIElement.UpdateLayout()