misc: disable ckeditor thumbnail generation for gif files (#29210)

combo/monkeypatch.py

@@ -22,7 +22,9 @@ from django.utils.html import conditional_escape
 from django.utils.safestring import mark_safe
 from django.utils.translation import get_language
 
+import ckeditor.views
 import ckeditor.widgets
+from ckeditor.image import pillow_backend
 
 def ckeditor_render(self, name, value, attrs=None):
     if value is None:
@@ -51,3 +53,20 @@ def ckeditor_render(self, name, value, attrs=None):
     }))
 
 ckeditor.widgets.CKEditorWidget.render = ckeditor_render
+
+orig_should_create_thumbnail = pillow_backend.should_create_thumbnail
+
+def should_create_thumbnail(file_path):
+    if file_path.endswith('.gif'):
+        # disable thumbnails for gif to workaround
+        # https://github.com/python-pillow/Pillow/issues/2803
+        return False
+    return orig_should_create_thumbnail(file_path)
+
+
+def get_backend():
+    backend = pillow_backend
+    backend.should_create_thumbnail = should_create_thumbnail
+    return backend
+
+ckeditor.views.image_processing.get_backend = get_backend