Progress® Telerik® UI for WPF Feedback Portal

Completed

Last Updated: 11 Nov 2025 08:11 by ADMIN

Release Telerik UI for WPF 2025.4.1111 (2025 Q4)

RichTextBox: Importing an HTML that contains an image with align attribute does not apply the alignment

Created by: Stenly

Comments: 0

Category: RichTextBox

Type: Bug Report

RichTextBox: Importing an HTML that contains an image with align attribute does not apply the alignment

When importing an HTML string that contains an image, which has an align attribute, the image creation logic on import does not take this attribute's value and apply it.

Completed

Last Updated: 11 Nov 2025 08:11 by ADMIN

Release Telerik UI for WPF 2025.4.1111 (2025 Q4)

RichTextBox: Exceptions occur on loading documents with element tags that don't have direct content but are using opening and closing tags instead of self-closing tags

Created by: Martin Ivanov

Comments: 0

Category: RichTextBox

Type: Bug Report

RichTextBox: Exceptions occur on loading documents with element tags that don't have direct content but are using opening and closing tags instead of self-closing tags

The RichTextBox internal logic that imports .docx documents (DocxFormatProvider) doesn't support elements that don't need direct content, but have both start and end tags. Instead such elements should use self-closing tags.

For example, instead of <w:vertAlign w:val="baseline"></w:vertAlign> it should be <w:vertAlign w:val="baseline"/>

When such element is read during import, issues may occur. Two main known issues here are with the w:vertAlign and Relationship tags.

Using

<w:vertAlign w:val="baseline"></w:vertAlign>

instead of

<w:vertAlign w:val="baseline"/>

throws NullReferenceException with the following stack trace:

System.NullReferenceException: 'Object reference not set to an instance of an object.'
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.OpenXmlHelper.ConvertStringToBaselineAlignment(string value) Line 168 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.SpanStyleImporter.ReadBaselineAlignment(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Parsing.Style style) Line 243 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.SpanStyleImporter.ReadStyle(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Parsing.Style style) Line 88 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.StyleDefinitionsImporter.ReadSpanStyleProperties(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Parsing.Style style) Line 278 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.StyleDefinitionsImporter.ReadStyle() Line 188 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.StyleDefinitionsImporter.Import() Line 67 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase importer) Line 430 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentAndRelationsFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase importer) Line 406 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.Import() Line 190 C#  
Telerik.Windows.Documents.FormatProviders.OpenXml.dll!Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.DocxFormatProvider.Import(System.IO.Stream input) Line 147 C#
Telerik.Windows.Documents.dll!Telerik.Windows.Documents.FormatProviders.DocumentFormatProviderBase.Import(byte[] input) Line 90 C#

Using

<Relationship Id="rId00004" Target="styles.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"></Relationship>

instead of

<Relationship Id="rId00004" Target="styles.xml" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"/>

throws KeyNotFoundException with the following stack trace:

KeyNotFoundException: The given key was not present in the dictionary.
    System.ThrowHelper.ThrowKeyNotFoundException() in ThrowHelper.cs
    System.Collections.Generic.Dictionary<TKey, TValue>.this[TKey].get(TKey) in Dictionary.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.PartRelationsImporter.GetRelationByID(string) in PartRelationsImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.GetRelationByID(string) in DocxImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.BuildSection() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.BuildBody() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.BuildDocument() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.MainDocumentImporter.Import() in MainDocumentImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase) in DocxImporter.cs
    Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxImporter.ReadXmlContentAndRelationsFromPackage(Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.Import.DocxPartImporterBase) in DocxImporter.cs

To work this around, import the document with the WordsProcessing library. If you need to display it in RadRichTextBox, you can export it again using the WordsProcessing library. This will normalize the tags. Then import it again using the RadDocument's DocxFormatProvider.

 var dplDocxFormatProvider = new Telerik.Windows.Documents.Flow.FormatProviders.Docx.DocxFormatProvider();
 RadFlowDocument flowDocument = dplDocxFormatProvider.Import(File.ReadAllBytes("../../../test.docx"), null);

 var docBytes = dplDocxFormatProvider.Export(flowDocument, null);
 File.WriteAllBytes("../../../modified-doc.docx", docBytes);

 var rtbDocxFormatProvider= new Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.DocxFormatProvider();
 RadDocument document = rtbDocxFormatProvider.Import(File.ReadAllBytes("../../../modified-doc.docx"));

Completed

Last Updated: 11 Nov 2025 08:11 by ADMIN

Release Telerik UI for WPF 2025.4.1111 (2025 Q4)

RichTextBox: Document exported to DOCX with 2025 Q2 cannot be opened by 2025 Q1

Created by: Daniel

Comments: 4

Category: RichTextBox

Type: Bug Report

RichTextBox: Document exported to DOCX with 2025 Q2 cannot be opened by 2025 Q1

Document exported to DOCX with 2025 Q2 cannot be opened by 2025 Q1 or previous versions.

Workaround: Use document processing to fix the document.

var processing_provider = new Telerik.Windows.Documents.Flow.FormatProviders.Docx.DocxFormatProvider();

var document = processing_provider.Import(File.ReadAllBytes("C:\\Users\\test\\Downloads\\word1.docx"),null);
var bytes_ = processing_provider.Export(document, null);

var rtb_provider = new Telerik.Windows.Documents.FormatProviders.OpenXml.Docx.DocxFormatProvider();
var doc = rtb_provider.Import(bytes_);
radRichTextBox.Document = doc;

Completed

Last Updated: 11 Nov 2025 08:11 by ADMIN

Release Telerik UI for WPF 2025.4.1111 (2025 Q4)

RichTextBox: Custom annotations are not rendered correctly when they have no content and are right aligned.

Created by: Mark

Comments: 0

Category: RichTextBox

Type: Bug Report

RichTextBox: Custom annotations are not rendered correctly when they have no content and are right aligned.

RichTextBox: Custom annotations are not rendered correctly when they have no content and are right-aligned (gif Attached).

Completed

Last Updated: 11 Nov 2025 08:11 by ADMIN

Release Telerik UI for WPF 2025.4.1111 (2025 Q4)

RichTextBox: Exporting documents (RadDocument) to docx format produces an invalid file

Created by: Martin Ivanov

Comments: 2

Category: RichTextBox

Type: Bug Report

RichTextBox: Exporting documents (RadDocument) to docx format produces an invalid file

Exporting RadDocument to docx format (using the DocxFormatProvider) produces an invalid file. The file is read properly by document viewers like RadRichTextBox or MS Word, but if you open it with "Open XML SDK Productivity Tool for Microsoft Office" or another app that validates documents, the document is treated as invalid.

To work this around, you can import the invalid .docx document using the RadWordsProcessing library (and its RadFlowDocument) and then export it again with RadWordsProcessing.

Completed

Last Updated: 12 Aug 2025 10:30 by ADMIN

Release 2025.3.812 (2025 Q3)

RichTextBox: When selecting spans, some of which belong to a list, the numbering option does not allow for adding them in the existing list

Created by: Stenly

Comments: 0

Category: RichTextBox

Type: Bug Report

RichTextBox: When selecting spans, some of which belong to a list, the numbering option does not allow for adding them in the existing list

Performing selection on spans, some of which are present in a list, does not allow for including all of them in the list. Instead, the current list will have to be removed and reapplied to all selected spans.

Completed

Last Updated: 21 May 2025 07:52 by ADMIN

Release 2025.2.521 (2025 Q2)

RichTextBox: Text locked or not visible after spacebar in Japanese

Created by: Adam

Comments: 1

Category: RichTextBox

Type: Bug Report

RichTextBox: Text locked or not visible after spacebar in Japanese

The operating system region and language needs to be set to Japanese.

RichTextBox seems to have several issues with Japanese, but being locked from visibility or edit is the biggest one.

To recreate, start typing in Japanese, push the "right" arrow after selecting the IME option desired, then hit "spacebar." This seems to duplicate the text, then when trying to continue to type into the text field the text is no longer visible (yet the IME does display).

The native WPF RichTextBox has no issues (and also supports partial selection, etc.).

I've attached a video to show the behavior with 2025 Q1 telerik.

*note:* This is on a machine with NVIDIA graphics. I mention this as there may be some issues with RichTextBox and the hardware... When I'm in a virtual machine with a completely Japanese environment and virtual graphics driver, there is NO text visible at all when trying to type into the RichTextBox. Works fine with other controls and wpf RichTextBox.

Completed

Last Updated: 21 May 2025 07:52 by ADMIN

Release 2025.2.521 (2025 Q2)

RadRichTextBox: Exception when one parses styles that contain specific (German) characters

Created by: Daniel

Comments: 2

Category: RichTextBox

Type: Bug Report

RadRichTextBox: Exception when one parses styles that contain specific (German) characters

RadRichTextBox: Exception when one parses styles that contain specific (German) characters.

Completed

Last Updated: 21 May 2025 07:52 by ADMIN

Release 2025.2.521 (2025 Q2)

RichTextBox: If i select multiple Paragraphs and TabForward, all paragraphs will be indented by [indent value]*[selected paragraphs]

Created by: Simon

Comments: 0

Category: RichTextBox

Type: Bug Report

RichTextBox: If i select multiple Paragraphs and TabForward, all paragraphs will be indented by [indent value]*[selected paragraphs]

If I select multiple Paragraphs and TabForward, all paragraphs will be indented by [indent value]*[selected paragraphs]

Completed

Last Updated: 21 May 2025 07:52 by ADMIN

Release 2025.2.521 (2025 Q2)

RichTextBox: Tab backwards command does not move the caret correctly in a table

Created by: Stenly

Comments: 0

Category: RichTextBox

Type: Feature Request

RichTextBox: Tab backwards command does not move the caret correctly in a table

Having a table, for example, with empty cells, executing the TabBackwardsCommand does not move the caret to the previous cell of the row.

Completed

Last Updated: 21 May 2025 07:52 by ADMIN

Release 2025.2.521 (2025 Q2)

ADMIN

RichTextBox: Importing RTF or DOCX document which contains hyperlink, adds simultaneously FieldRangeStart and HyperlinkRangeStart to the document

Created by: Tanya

Comments: 0

Category: RichTextBox

Type: Bug Report

RichTextBox: Importing RTF or DOCX document which contains hyperlink, adds simultaneously FieldRangeStart and HyperlinkRangeStart to the document

This causes some problems if the hyperlink is edited and the document is exported and imported again.
Workaround:
private void RadRichTextBox1_DocumentChanged(object sender, EventArgs e)
{
    var document = radRichTextEditor1.Document;

    var fields = document.EnumerateChildrenOfType<FieldRangeStart>();

    foreach (FieldRangeStart item in fields)
    {
        radRichTextEditor1.DeleteAnnotationRange(item);
    }
}

Completed

Last Updated: 21 May 2025 07:52 by ADMIN

Release 2025.2.521 (2025 Q2)

RichTextBox: New line is ignored after a non-breaking space

Created by: Trevor

Comments: 0

Category: RichTextBox

Type: Bug Report

RichTextBox: New line is ignored after a non-breaking space

When a new line is placed right after a nbsp, the new line is ignored in the layout. This can be reproduced by importing the following HTML:

First <br/>Second

Completed

Last Updated: 24 Feb 2025 10:51 by ADMIN

Release 2025.1.211 (2025 Q1)

RichTextBox: Keys in Traditional Chinese with touch keyboard are duplicated

Created by: Madhan

Comments: 4

Category: RichTextBox

Type: Bug Report

RichTextBox: Keys in Traditional Chinese with touch keyboard are duplicated

Keys in Traditional Chinese On-screen Keyboard are duplicated.

Completed

Last Updated: 11 Feb 2025 07:40 by ADMIN

Release 2025.1.211 (2025 Q1)

RichTextBox: SocketException thrown when the UriSource of the ImageInline is assigned to image from the web and the server closes the connection

Created by: Martin Ivanov

Comments: 0

Category: RichTextBox

Type: Bug Report

RichTextBox: SocketException thrown when the UriSource of the ImageInline is assigned to image from the web and the server closes the connection

A SocketException can occur when the ImageInline source is assigned to a link pointing to a picture on a remote server (a website). For example: UriSource ="https://docs.telerik.com/devtools/wpf/knowledge-base/images/kb-chartview-categorical-and-datetime-axis-0.png"

This could happen during the fetching of the image stream. In some cases, the server may give a NetworkStream or ConnectionStream, or similar Stream implementation, which keeps an open connection between the application and the server. If the connection get severed during the stream reading, an exception is thrown.

The exception message is: "Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host."

The stacktrace is:

Exception Info: System.Net.Sockets.SocketException
  at System.Net.Sockets.NetworkStream.Read(Byte[], Int32, Int32)
Inner Exception:
Exception Info: System.IO.IOException
  at System.Net.ConnectStream.Read(Byte[], Int32, Int32)
  at System.IO.Stream.InternalCopyTo(System.IO.Stream, Int32)
  at Telerik.Windows.Documents.Layout.ExtensionMethods.ToMemoryStream(System.IO.Stream)
  at Telerik.Windows.Documents.Model.ImageInline.<SetStreamFromUriSource>b__0(System.Object, StreamReadyEventArgs)
  at Telerik.Windows.Documents.Utils.ResourceStreamLocator.OnStreamReady()
  at System.Net.WebClient.OnOpenReadCompleted(System.Net.OpenReadCompletedEventArgs)
  at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
  at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
  at System.Windows.Threading.DispatcherOperation.InvokeImpl()
  at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(System.Object)
  at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
  at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
  at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
  at MS.Internal.CulturePreservingExecutionContext.Run(MS.Internal.CulturePreservingExecutionContext, System.Threading.ContextCallback, System.Object)
  at System.Windows.Threading.DispatcherOperation.Invoke()
  at System.Windows.Threading.Dispatcher.ProcessQueue()
  at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
  at MS.Win32.HwndWrapper.WndProc(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
  at MS.Win32.HwndSubclass.DispatcherCallbackOperation(System.Object)
  at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
  at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
  at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32)
  at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr)
  at MS.Win32.UnsafeNativeMethods.DispatchMessage(System.Windows.Interop.MSG ByRef)
  at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame)
  at System.Windows.Application.RunDispatcher(System.Object)
  at System.Windows.Application.RunInternal(System.Windows.Window)

Completed