When rendering a PDF document page in FixedDocumentSinglePagePresenter, blank pages are displayed, when the document contains images.

CreateThumbnail of ThumbnailFactory leads to InvalidOperationException: 'The calling thread cannot access this object because a different thread owns it.', when called from separate STA thread.

This is Unicode (UCS-2) encoding for the Adobe-GB1 character collection.

Described on page 443 in Pdf Reference 1.7.

User is not able to type in the form fields on touch devices.

When importing document with text containing char code mapped to .notdef glyph name an ArgumentException: 'The encoding is not supported.' is thrown.

When saving Form Fields in document defined with linearized PDF structure, it produces a document that fails to open in Edge.

The current implementation of the RadPdfViewer Save uses the incremental update feature. However, the incremental update doesn't comply with the linearized structure and the document fails to open in some viewers.

Workaround: Import/export the document with PdfPRocessing to remove the linearization feature.

The offset of the Page boundaries such as CropBox, MediaBox, BleedBox, and ArtBox is not respected and is always treated as 0 which causes misplaced Annotations.

Visualizing a page with a huge number of images (40000) freezes the application.
When switching to the FixedDocumentSinglePageViewPresenter, all the page content should be loaded so it can be later rendered. Although the images are loaded asynchronously, there are too many threads started which seems to cause the hang. Also, according to profiling results, it seems like the image caching causes performance diminishments in such scenarios. 

When the font is not embedded in the document, PdfViewer tries to read it from the OS. However, the Calibri-Font is not properly parsed and a NullReferenceException is thrown internally for its encoding. 

When importing the document as DocumentSource the stream will be loaded asynchronously and the document won't be loaded when the Print() method is called, NullReferenceException is thrown.

Use the attached project to reproduce. 

Workaround:

var combo = toolbar.ChildrenOfType<PercentComboBox>().FirstOrDefault();

var binding = new System.Windows.Data.Binding();
binding.Path = new System.Windows.PropertyPath("ScaleFactor");
binding.Mode = System.Windows.Data.BindingMode.TwoWay;
binding.Source = pdfViewer;
binding.UpdateSourceTrigger = System.Windows.Data.UpdateSourceTrigger.PropertyChanged;
BindingOperations.SetBinding(combo, PercentComboBox.ValueProperty, binding);

var binding1 = new System.Windows.Data.Binding();
binding1.Source = pdfViewer;
BindingOperations.SetBinding(combo, PercentComboBox.RadPdfViewerProperty, binding);

Add support for respecting Custom UI Layers when exporting Fixed Page to an image.

The stroke is not rendered when the text is in XForm

To reproduce:

- Search for a specific word until the last occurrence is found and a message appears. 

- Click the FindPrevious button

Result: A message appears.

Expected: The previous entry is selected. 

Document with invalid cross-reference stream is not loaded correctly

There is an exception when the destination is pointing to a page array. This should be handled so the document is displayed. 

Whitespaces are ignored when copy-pasting from PdfViewer to another text redactor.

Unsupported annotations are rendered on top of other content. When there is a form field that appears inside the annotation, it cannot be clicked or interacted with as the annotation is capturing the mouse gestures.

WPF controls are used to visualize the form fields in PdfViewer. However, these controls inherit the background defined in the PdfViewer's theme instead of a background of the form field control. This leads to wrong visualization mostly in the dark themes as the content inside the form field might get unreadable.

Documents containing large images are slow to decompress and decode.