PI: Re-use content stream (#2101)

pypdf/_page.py

@@ -882,12 +882,17 @@ def _content_stream_rename(
 
  @staticmethod
  def _push_pop_gs(
- contents: Any, pdf: Union[None, PdfReaderProtocol, PdfWriterProtocol]
+ contents: Any,
+ pdf: Union[None, PdfReaderProtocol, PdfWriterProtocol],
+ use_original: bool = True,
  ) -> ContentStream:
  # adds a graphics state "push" and "pop" to the beginning and end
  # of a content stream. This isolates it from changes such as
  # transformation matricies.
- stream = ContentStream(contents, pdf)
+ if use_original:
+ stream = contents
+ else:
+ stream = ContentStream(contents, pdf)
  stream.operations.insert(0, ([], "q"))
  stream.operations.append(([], "Q"))
  return stream
@@ -1120,7 +1125,7 @@ def _merge_page(
  original_content = self.get_contents()
  if original_content is not None:
  new_content_array.append(
- PageObject._push_pop_gs(original_content, self.pdf)
+ PageObject._push_pop_gs(original_content, self.pdf, use_original=True)
  )
 
  page2content = page2.get_contents()