From 2e908386e0703f211bcf10129345b4a4dfef4e76 Mon Sep 17 00:00:00 2001
From: Martin Thoma <info@martin-thoma.de>
Date: Fri, 10 Feb 2023 23:03:25 +0100
Subject: [PATCH] ENH: Make used cropbox configurable

---
 pypdf/__init__.py | 2 ++
 pypdf/_page.py    | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/pypdf/__init__.py b/pypdf/__init__.py
index 3ddd264f1e..83c1d82fe8 100644
--- a/pypdf/__init__.py
+++ b/pypdf/__init__.py
@@ -16,6 +16,8 @@
 from .pagerange import PageRange, parse_filename_page_ranges
 from .papersizes import PaperSize
 
+MERGE_CROP_BOX = "cropbox"  # pypdf<=3.4.0 used 'trimbox'
+
 __all__ = [
     "__version__",
     "PageRange",
diff --git a/pypdf/_page.py b/pypdf/_page.py
index 80d98287bd..892a23e790 100644
--- a/pypdf/_page.py
+++ b/pypdf/_page.py
@@ -44,6 +44,7 @@
     cast,
 )
 
+from . import MERGE_CROP_BOX
 from ._cmap import build_char_map, unknown_char_map
 from ._protocols import PdfReaderProtocol, PdfWriterProtocol
 from ._utils import (
@@ -844,7 +845,7 @@ def _merge_page(
         page2content = page2.get_contents()
         if page2content is not None:
             page2content = ContentStream(page2content, self.pdf)
-            rect = page2.trimbox
+            rect = getattr(page2, MERGE_CROP_BOX)
             page2content.operations.insert(
                 0,
                 (
@@ -972,7 +973,7 @@ def _merge_page_writer(
         page2content = page2.get_contents()
         if page2content is not None:
             page2content = ContentStream(page2content, self.pdf)
-            rect = page2.trimbox
+            rect = getattr(page2, MERGE_CROP_BOX)
             page2content.operations.insert(
                 0,
                 (