Whenever the focus is on RadRichTextBox, the keyboard is displayed with Uppercase by Default. After inputting 2-3 characters in uppercase, it changes to lowercase and then alternates between uppercase and lower per character.

When a data provider is used, the designer does not show the RadRichTextBox content, that is shown with no problem at run time.

Workaround: The issue is with finding the format provider used by the data provider. This issue appears at design time only. The workaround is to manually set the format provider of the data provider:
        <telerik:HtmlDataProvider
            x:Name="htmlDataProvider"
            RichTextBox="{Binding ElementName=radRichTextBox, Mode=OneWay}"
            Html="&lt;h1&gt;Header3&lt;/h1&gt;">
            <telerik:HtmlDataProvider.FormatProvider>
                <telerik:HtmlFormatProvider />
            </telerik:HtmlDataProvider.FormatProvider>
        </telerik:HtmlDataProvider>

When RTF documents are imported simultaneously in different threads, sometimes ArgumentException with message "An item with the same key has already been added" is thrown with the following call stack:

at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at Telerik.Windows.Documents.FormatProviders.ReplaceStyleNameHandler.Add(String displayName, String name)
   at Telerik.Windows.Documents.FormatProviders.ReplaceStyleNameHandler.InitializeStyleDisplayNameToStyleNameDictionary()
   at Telerik.Windows.Documents.FormatProviders.ReplaceStyleNameHandler.get_StyleDisplayNameToStyleName()
   at Telerik.Windows.Documents.FormatProviders.ReplaceStyleNameHandler.TryGetStyleNamesByStyleName(String displayName, RadDocumentDefaultStyleInfo& defaultStyleInfo)
   at Telerik.Windows.Documents.FormatProviders.ReplaceStyleNameHandler.Replace(ReplaceStyleNameContext context)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfStyleImporter.DoVisitText(RtfText text)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfElementIteratorBase.VisitElement(RtfElement element, Boolean recursive)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfElementIteratorBase.VisitGroupChildren(RtfGroup group, Boolean recursive)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfStyleImporter.ImportStyleGroup(RtfGroup group)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfStylesTable.FillStyle(RtfGroup group, StyleType type, Boolean isDefault)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfStylesTable.DoVisitGroup(RtfGroup group)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfElementIteratorBase.VisitElement(RtfElement element, Boolean recursive)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfElementIteratorBase.VisitGroupChildren(RtfGroup group, Boolean recursive)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfStylesTable.ReadTable(RtfGroup group, RtfImportContext context)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfHandlers.RtfGroupHandlers.StylesTableHandler(RtfGroup group, RtfImportContext context)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfDocumentImporter.DoVisitGroup(RtfGroup group)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfElementIteratorBase.VisitElement(RtfElement element, Boolean recursive)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfElementIteratorBase.VisitGroupChildren(RtfGroup group, Boolean recursive)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfDocumentImporter.ImportRoot(RtfGroup rtfGroup)
   at Telerik.Windows.Documents.FormatProviders.Rtf.Import.RtfDocumentImporter.Import(Stream input, RtfImportSettings settings)
   at Telerik.Windows.Documents.FormatProviders.Rtf.RtfFormatProvider.Import(Stream input)
   at Telerik.Windows.Documents.FormatProviders.Rtf.RtfFormatProvider.Import(String input)

Fix available in LIB Version 2018.3.924.

Open a docx file in richtextbox, if numpages in headers do any subtraction, it can not display correctly. see the attached pictures for how to display in richtextbox and microsoft word 2016.

Steps to reproduce:
1. Insert a table into the document with borders enabled
2. Zoom out so the zoom level is below 100%
Expected behavior: The borders are always rendered at a minimum of 1px width, even if the calculated size is below 1 at the current zoom level (This is what Word does)
Actual behavior: Some of the borders do not render.

Add the following code to an application with a RadRichTextBox in it:

for (var i = 0; i < 1000; i++)
{
    var doc = radRichTextBox.Document.CreateDeepCopy();
}

If your document does not contain any lists it behaves as expected: memory usage increases until the next GC when it is collected. If there are lists in your document the RadDocument instances created by CreateDeepCopy are never collected and your app will run out of memory.

Fix available in LIB Version 2018.3.1029.

When spell checking dialog is used for spell checking, and the user proceeds to the next word (either by changing with a suggestion, ignoring, etc.), the view port is not scrolled to include the next currently spell checked word.

Fix available in R3 2018 Official Release.

API ideas:

- DocumentSelection: Get inlines between annotation start and end, e.g. DocumentSelection.EnumerateChildrenOfType<>(bool includePartiallySelectedElements) where T : DocumentElement

- DocumentSelection: SelectAnnotationRange(AnnotationRangeStart start, bool includeAnnotation). Such method is present without the last parameter, but it always selects the annotation ranges

In Material theme, RadRichTextBox should be enclosed by border.
In Fluent theme, RadRichTextBox should have shadow.

The problems are more visible when RadRichTextBox.LayoutMode is Flow, but the border/shadow should also be present in Paged layout mode.

Fix available in R3 2018 SP1 release.

When pressing Shift+Up(Down) should create a selection to the start(end) of the document when the caret position is on the first(last) line. Currently, in this case, a selection is not created.

Such behavior can be achieved using the following approach:

        private void RadRichTextBox_CommandExecuting(object sender, CommandExecutingEventArgs e)
        {
            if (e.Command is MoveCaretCommand && System.Windows.Input.Keyboard.Modifiers == ModifierKeys.Shift)
            {
                var command = e.Command as MoveCaretCommand;
                MoveCaretDirections direction = (MoveCaretDirections)e.CommandParameter;
                if (direction == MoveCaretDirections.Up)
                {
                    var positionOnFirstLine = new DocumentPosition(this.radRichTextBox.Document);
                    positionOnFirstLine.MoveToFirstPositionInDocument();
                    if (this.radRichTextBox.Document.CaretPosition.Location.Y - positionOnFirstLine.Location.Y < 1)
                    {
                        this.radRichTextBox.Document.CaretPosition.MoveToPosition(positionOnFirstLine);
                        e.Cancel = true;
                    }
                }
                else if (direction == MoveCaretDirections.Down)
                {
                    var positionOnLastLine = new DocumentPosition(this.radRichTextBox.Document);
                    positionOnLastLine.MoveToLastPositionInDocument();
                    if (positionOnLastLine.Location.Y - this.radRichTextBox.Document.CaretPosition.Location.Y < 1)
                    {
                        this.radRichTextBox.Document.CaretPosition.MoveToPosition(positionOnLastLine);
                        e.Cancel = true;
                    }
                }
            }
        }

At this point, the FloatingUIContainers cannot be selected. Implement selection to enable the users to work easily with such elements.

Font weight, size and other current editing style properties are not preserved when document layout is performed, for example in the following cases:
- the document is in web layout mode and the controls is resized
- scroll bar changes its visibility.

Steps to reproduce:
- Set RadRichTextBox to Web layout mode.
- Type a word, select it and make it bold.
- Press enter and type a word
- Repeat the previous step until RadRichTextBox height is reached and scrollbar appear.
- Type a word.
Expected: The last word is bold.
Actual: The last word is not bold.

After performance investigation related to feedback item http://feedback.telerik.com/Project/143/Feedback/Details/171108 , one bottleneck was identified as redundant calls to internal methods for getting parent of a document element.

Available in LIB Version 2018.2.820.

The pgMar element might be present but the margin information might be missing as shown below:
<w:pgMar w:header="720" w:footer="720" />
At the moment this overwrites the section margin information with 0. Instead the margins should remain as is.

Fix available in LIB Version 2018.2.820.

The spacing between the letters is too big.

If the position is moved to the end of a paragraph by clicking with the mouse in the empty space just left of the paragraph text, sometimes the subsequent text input (typing, pasting) is inserted at the beginning of the next paragraph, instead of at the end of the clicked one. 

The issue is somewhat random and cannot be reproduced consistently, though it's not hard to reproduce if clicking and typing is fast enough.

Certain documents containing a table with a cell spanning on more than one row might cause the application to hang and throw OutOfMemoryException.

Workaround: Set SpacingAfter = 0 of the last paragraph in the table.

When the first table cell for a table row is vertically merged, the height of the row is exported improperly - instead the height of the row containing the beginning of the merged cell is exported.

This would enable the customers to track the content that is being inserted and decline its insertion if needed.

When the rtf document contains a table as the one below and the empty declaration is used in the following structure, the document cannot be imported:

{\fonttbl
{\f0 Verdana;}
{\f1 Times New Roman;}
{\f2 ;}
{\f3 Segoe UI;}}