Use poppler_document_save_a_copy(), which never saves the document

Use poppler_document_save_a_copy(), which never saves the document

2009-02-22  Carlos Garcia Campos  <carlosgc@gnome.org>

	* backend/pdf/ev-poppler.cc: (pdf_document_save),
	(pdf_document_forms_form_field_text_set_text),
	(pdf_document_forms_form_field_button_set_state),
	(pdf_document_forms_form_field_choice_select_item),
	(pdf_document_forms_form_field_choice_toggle_item),
	(pdf_document_forms_form_field_choice_unselect_all),
	(pdf_document_forms_form_field_choice_set_text):

	Use poppler_document_save_a_copy(), which never saves the document
	modifications, when saving an unmodified document. It makes saving
	a copy of encrypted PDFs work again. Fixes bug #566791.

svn path=/trunk/; revision=3493