The PDF document with images shows black canvas:

NOTE:

Works OK in version 2023.2.713
Broken in version 2023.3.1005

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.

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. 

PDF Signature(image) is displayed on the incorrect location when using annotations.

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.

The import performance is reduced and the memory consumption is increased when XObject instances have many Shading elements.

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

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. 

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.

Images hosted inside multiple Form XObjects are not rendered.

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

 Exception when rendering a file with a lot of RenderTargetBitmap objects (Com Exception: MILERR_WIN32ERROR). It seems that we are creating this for tilling patters which are not reused and we ca reconsider our appraoch.  

The text elements in a document are positioned wrongly and are slightly offset from their expected positions.

Currently, there are 10px of margin on each side of the FixedDocumentPresenter element showing the page. This is controlled by the PageMargins property of the PagesLayoutManagerBase class, which is set to a fixed value of 10. To change this, you will need to implement custom PagesLayoutManager and few other page presenter classes from scratch. 

Add a property that allows easily changing of the PageMargins value.

At this moment, you can work this around by setting the PageMargins via reflection.