From the PDF specification: "The current stroking alpha constant, specifying the constant shape or constant opacity value to be used for stroking operations in the transparent imaging model."

When RadPdfViewer is in text selection mode and the user is trying to select a word by double-clicking on it, the last letter of the word is not selected when the word is followed by some symbols like '.', ':', '(', '...'

Scanned document is not rendered with the new engine

Some Image XObjects are imported but not displayed in PdfViewer.

It seems all the documents contain scanned images produced by a Lexmark scanner.

VS 2022 designer exception when PdfViewer is dragged and dropped from the toolbox.

From PDF Specification: "The value of the field dictionary’s Ff entry is an unsigned 32-bit integer containing flags specifying various characteristics of the field. Bit positions within the flag word are numbered from 1 (low-order) to 32 (high-order)."

Field flags common to all field types: ReadOnly, Required, NoExport.

The Field textbox is too large when the field height is limited and the text is not visible when one is typing.

Handle the cases when the page is rendered slowly and the document appears empty

The PdfViewer has slow performance when rendering images that have large size but are scaled down.

An invalid certificate is not imported correctly and causes exception on export. We should be able to handle this and skip the import without breaking the file. 

Add UI for the Signature flags support.

When displaying PDF-Files using PDFViewer, ContentElementsCanvas .RenderAsync uses reflection (DispatcherObjectUtils.ApplyDispatcher) to render Visuals on multiple threads.
However this leads to a memory leak since the dispatchers cant be GC'ed, see screenshot below.




The Screenshot is from the actual application we expirienced this issue with, the attached reproduction example is a boiled down version of what your code does.
If you wanna reproduce this on your own, create an application that uses PdfViewer that switches between many pdf files. The ammount of Dispatchers will grow steadily, probably to a total of the number of threads used by Task.Factory.

Implement editor functionalities like add, edit or delete content.

When rendering PDF file with a TrueType font and Unicode platform Id (platformId: 0), glyphs are not obtained from CMAP table and are displayed with default rectangle placeholders.

The leak is reproducible when printing documents without UI and results in multiple instances of DocumentPrintPresenter kept alive in the memory.

This type of dictionary allows users to specify files and define different files for different systems or platforms.

The image quality is poor when rendering large images.

PDFViewer crashes, when used on a tablet, Text selection is activated and text is selected in Touch mode.

Allow passing specific pages (e.g. "1, 4, 6") and more than one page range (e.g. "1-3, 6-7") to the print dialog`s Pages page range.