Handle the import of documents with an invalid cross-reference stream offset.

Handle the case where the document has edit, copy password but no open password. We should either suppress the UserPasswordNeeded event or provide information about the password options in the arguments. 

By specification, the FontDescriptor is required except for Standard fonts. However, if some font has only a declaration of FontDescriptor but with a missing definition, the document is not exported successfully.

Update the "fx:Version" metadata mapping for the XRechnung conformance level.

The method should create deep copy of  the current page.

Add support for array formulas (CellFormulaType "array"). These formulas can accept as parameters and return results containing whole arrays (one- or two- dimensional) of data. In MS Excel, such formulas are inserted with CTRL + SHIFT + Enter, and visualized enclosed with curly brackets ('{' and '}'). 

MethodAccessException is thrown when exporting documents using .NET Standard references in a .NET Framework environment.

The stack shows 1070 repeated frames of:

• StructElementObject.ProcessChildPrimitive(...)
• StructElementObject.CopyPropertiesTo(...)

The StructureTree import is traversing a cyclic StructElement graph (or equivalent re-entrant child chain) without a recursion guard.

During this recursion, indirect object resolution repeatedly re-enters the same compressed object:

• reference.ObjectNumber = 554
• context.CurrentIndirectReference.ObjectNumber = 554
• TryGetIndirectObject(554, ...) == false at re-entry

PdfStreamWriter: Duplicated pages when merging documents with identical page content streams but different per-page Resources.

Workaround: Use the RadFixedDocument.Merge() method instead of the PdfStreamWriter.

NullReferenceException is thrown when importing a document with missing Owner (O) in tagged structure attributes.

Add support for horizontal lines in documents.

In DOCX, such lines are defined using the legacy VML definitions:
The definitions above and the <hr/> HTML tag are currently not supported and skipped on import, leading to missing horizontal lines in the document.

Text frames are paragraphs of text in a document which are positioned in a separate region or frame in the document and can be positioned with a specific size and position relative to non-frame paragraphs in the current document. More information about it is available in section 22.9.2.18 ST_XAlign (Horizontal Alignment Location) of Open Office XML.