Applies every group's usage state for usageEvent (ViewState, PrintState or ExportState)
whether or not an auto-state entry asks for it, as pdf.js and PDFBox do. Not the specification's behaviour: for engine parity only.
public PdfOptionalContentState ApplyUsageStates(PdfOptionalContentState state, PdfOptionalContentEvent usageEvent)
The current states.
Which usage state to apply.
ISO 32000-2 §8.11.4.4 says usage states apply only through AS ("If no AS entry is present, states shall not be automatically adjusted").