Zooming changes the current page number in continuous view.

GoToPage() method is not working correctly in some cases when called in DocumentChanged event handler. The known cases are described below:

   1. When RadPdfViewer and the document are loaded initially and document is set through the RadPdfViewer.Document property.
Workaround: DocumentSource property could be set (in XAML or in code-behind) instead of the Document property. If the Document property is used, this should be done after RadPdfViewer is loaded.

    2. When the ScaleMode is changed in DocumentChanged event handler and then GoToPage() method is called in the same event handler.

Text selection in RadPdfViewer exhibits precision issues where mouse-based selection struggles to accurately capture desired text boundaries. Selection frequently overshoots or undershoots the intended range, and copied text may contain duplicated content or unexpected spacing artifacts.

When the Pdf document contains a big image, for example 3650 x 2220, the image size gets reduced while rendering. This changes the quality of the image and the page is rendered blurry.

Introduce events similar to the PageRenderStarted and PageRenderCompleted ones that the Telerik UI for WinForms RadPdfViewer provides:

WinForms PdfViewer How-To Handle Rendering Events - Telerik UI for WinForms

The edited value of an interactive form field (for example TextBox) is not committed when the form goes outside of the viewport while still in edit mode.

OutOfMemoryException has thrown when creating a thumbnail with the ThumbnailFactory.

This behavior is observed with binaries version 2020.2.513 or later.

The size of some images in specific documents is scaled and positioned wrongly.

Expose API that allows you to add/remove Annotations/IPointerHandler implementations from the PointerHandlersController.

Currently, RadPdfViewer doesn't allow you to render notes/comments added to the highlight annotations. Add the option to render this and possibly allow editing. 

The path objects are not drawn with correct background.

Add support for handwritten (graphometric information) signatures in the PdfViewer. 

Wrong color of lines due to Matrix Transformations applied to the Drawing.

Some lines could be missing in the PdfViewer when rendering line geometries.

The attached image shows the issue.

Glyphs with specific font added to the document are not rendered. 

Layers represent groups of optional content which can be hidden or shown.

PdfViewer: The selected page is not synchronized with the selected index in the Thumbnail view when a document is opened manually. This issue occurs in the thumbnail example in the demo applicationl. 

The default WPF PrintDialog cannot print asynchronously when it is shown in UI. However, you may see the demo in this forum post showing how to create custom PrintDialog and perform async printing with it:
http://www.telerik.com/forums/pdfviewer-print-makes-ui-unresponsive#js0YdzFWc0Oa8C3g6a18lg

Currently, the Save button of the RadPdfViewerToolBar element raises the SaveAsPdfDocumentCommand, which opens a new SaveFileDialog in its Execute method. We could raise an event there, in order for this action to be intercepted if the PDF file is saved.

Some documents cannot be printed with the PdfViewer. In this case no exception is thrown and the result file is 0 bytes.