Missing content when converting a specific PDF to images (mostly text and shapes).

Provide a consistent API for cloning document elements. Currently, we have a public API for cloning documents but not their elements. 

Currently, when users need to add content to an existing page that is rotated, they should manually calculate the positions of the new content if they need to align it with the appearance of the page. Add API allowing them to easily transform the position respecting the top left edge of the page after its rotation.

According to the PDF Specification: The definition of an indirect object in a PDF file consists of its object number and generation number, followed by the value of the object bracketed between the keywords obj and endobj. For example, the definition:
An invalid case:

ArgumentException when the font box contains negative width or height 

When importing documents with more than one cross-reference table that have not Prev tables specified the incorrect table is processed.

After signing a document using the PdfProcessing library and the document is loaded in Adobe Acrobat an error is shown when the signature widget is clicked:
Error during signature verification.  

Adobe Acrobat error.
Expected a dict object.

Wrong matrix calculations lead to incorrect image (Form XObject) during export

The images inside form sources are not correctly positioned and might be invisible.

This issue is regression it works with R2 2020.

Wrong matrix calculations lead to incorrect image (Form XObject) size.

In specific cases when importing a document containing an Indirect Reference keyword ("R") within an image data an exception is thrown: InvalidCastException: 'Unable to cast object of type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Operators.State.SetLineDashPattern' to type 'Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.Model.Types.PdfInt'.'

InvalidCastException is thrown when importing a document containing Byte order marks (BOM) at the beginning of the file. The bytes are read as part of the document content and this changes all the document`s offsets.

Importing a document containing an EI keyword within the image stream leads to an endless loop and the document is not imported successfully.

The import freezes due to a lot of checks in the HandleInvalidClippingPathOperatorPosition method.

Support for validating signature fields signed with signatures that are encoded in ETSI.RFC3161 encoding should be added.

Currently, when invoking the Signature`s TryValidate() method an exception is thrown: NotSupportedException: 'No signature validation handler was found for the subfilter: ETSI.RFC3161'

When inserting a specific Jpeg image with an ICC profile there is a problem when opening the file in Adobe: 



On the other hand, the PDF is successfully opened by browsers and most PDF viewers.

Table cell content is not displayed after PDF export if cell Preferred Width is too small.

Workaround: Make cell Size(Preferred Width) big enough for the contents to fit.

 

Incorrect cell borders when converting to PDF and a table that contains borders with different colors.

With the current implementation when passing the font file using the FontsRepository the entire font file is embedded.

In order to embed only a subset of characters used in the document, the font should be installed and the font shouldn't be registered in the FontsRepository.

When importing a document containing an EI keyword not followed by space or return an exception is thrown: EndOfStreamException: 'Attempted to read past the end of the stream.'