artresizer: add a comment to clarify the meaning of class variables
@@ -76,6 +76,10 @@ class LocalBackend:
class IMBackend(LocalBackend):
NAME = "ImageMagick"
+
+ # These fields are used as a cache for `version()`. `_legacy` indicates
+ # whether the modern `magick` binary is available or whether to fall back
+ # to the old-style `convert`, `identify`, etc. commands.
_version = None
_legacy = None
