FocusedFormFieldTextForPage function

FocusedFormFieldTextForPage reads the text of the currently focused form widget for the supplied PDFium form handle and page

Use it when low-level form code needs the same focused-text result exposed by TPdf.FocusedFormFieldText and TPdfView.FocusedFormFieldText

• Returns an empty string when no text field is focused
• The helper does not move focus or change form state