code: func (f *Fpdf) AddPage() {
  	if f.err != nil {
  		return
  	}
  	// dbg("AddPage")
  	f.AddPageFormat(f.defOrientation, f.defPageSize)
  	return
  }
docs: // AddPage adds a new page to the document. If a page is already present, the
  // Footer() method is called first to output the footer. Then the page is
  // added, the current position set to the top-left corner according to the left
  // and top margins, and Header() is called to display the header.
  //
  // The font which was set before calling is automatically restored. There is no
  // need to call SetFont() again if you want to continue with the same font. The
  // same is true for colors and line width.
  //
  // The origin of the coordinate system is at the top-left corner and increasing
  // ordinates go downwards.
  //
  // See AddPageFormat() for a version of this method that allows the page size
  // and orientation to be different than the default.