Revert the raw_content document checksum change

Choosing between .content and .raw_content belongs in the general binary content handling
(#1334), which will be done separately. The browser PDF test and the early "PDF not available"
check stay.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

changedetectionio/processors/base.py

@@ -411,13 +411,7 @@ class difference_detection_processor():
     def get_raw_document_checksum(self):
         checksum = None
 
-        # PDF only - checksum the PDF document itself, .content may not represent it (in a browser
-        # fetcher it can be the PDF viewer's HTML wrapper, the same for every version of the document).
-        # Everything else keeps using .content
-        raw_content = self.fetcher.raw_content
-        if isinstance(raw_content, bytes) and b'%PDF' in raw_content[:1024]:
-            checksum = hashlib.md5(raw_content).hexdigest()
-        elif self.fetcher.content:
+        if self.fetcher.content:
             checksum = hashlib.md5(self.fetcher.content.encode('utf-8')).hexdigest()
 
         return checksum

changedetectionio/tests/unit/test_raw_document_checksum.py

@@ -1,31 +0,0 @@
-#!/usr/bin/env python3
-
-import hashlib
-from types import SimpleNamespace
-
-from changedetectionio.processors.base import difference_detection_processor
-
-
-def _checksum(content, raw_content):
-    processor = object.__new__(difference_detection_processor)
-    processor.fetcher = SimpleNamespace(content=content, raw_content=raw_content)
-    return processor.get_raw_document_checksum()
-
-
-def test_html_uses_content():
-    # requests sets raw_content for every page, but non-PDF checksums must stay on .content
-    html = '<html><body>hello</body></html>'
-    assert _checksum(html, html.encode('utf-8') + b'\n') == hashlib.md5(html.encode('utf-8')).hexdigest()
-    assert _checksum(html, None) == hashlib.md5(html.encode('utf-8')).hexdigest()
-
-
-def test_pdf_uses_raw_content():
-    pdf = b'%PDF-1.4\nsome pdf body'
-    viewer_html = '<html><body><embed type="application/pdf"></body></html>'
-    # The browser's PDF viewer HTML is the same for every version, the PDF bytes are what count
-    assert _checksum(viewer_html, pdf) == hashlib.md5(pdf).hexdigest()
-    assert _checksum(viewer_html, pdf) != _checksum(viewer_html, pdf + b'changed')
-
-
-def test_nothing_fetched():
-    assert _checksum(None, None) is None