Update content-disposition parsing workaround

Also adds workaround for https://github.com/python/cpython/issues/93010

qutebrowser/browser/webkit/http.py

@@ -89,13 +89,16 @@ class ContentDisposition:
         try:
             parsed = reg('Content-Disposition', decoded)
         except IndexError:  # pragma: no cover
-            # WORKAROUND for https://bugs.python.org/issue37491
+            # WORKAROUND for https://github.com/python/cpython/issues/81672
             # Fixed in Python 3.7.5 and 3.8.0.
             # Still getting failures on 3.10 on CI though
             raise ContentDispositionError("Missing closing quote character")
         except ValueError:  # pragma: no cover
-            # WORKAROUND for https://bugs.python.org/issue42946
+            # WORKAROUND for https://github.com/python/cpython/issues/87112
             raise ContentDispositionError("Non-ASCII digit")
+        except AttributeError:
+            # WORKAROUND for https://github.com/python/cpython/issues/93010
+            raise ContentDispositionError("Section number has an invalid leading 0")
 
         if parsed.defects:
             defects = list(parsed.defects)

tests/unit/browser/webkit/http/test_http.py

@@ -44,6 +44,21 @@ def test_no_content_disposition(stubs, url, expected):
     assert filename == expected
 
 
+@pytest.mark.parametrize('value', [
+    # https://github.com/python/cpython/issues/87112
+    'inline; 0*²'.encode("iso-8859-1"),
+    # https://github.com/python/cpython/issues/81672
+    b'"',
+    # https://github.com/python/cpython/issues/93010
+    b'attachment; 0*00="foo"',
+    # FIXME: Should probably have more tests if this is still relevant after
+    # dropping QtWebKit.
+])
+def test_parse_content_disposition_invalid(value):
+    with pytest.raises(http.ContentDispositionError):
+        http.ContentDisposition.parse(value)
+
+
 @pytest.mark.parametrize('template', [
     '{}',
     'attachment; filename="{}"',