FIX: XML files could be detected as SVG files

lib/freedom_patches/fast_image.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# Remove when https://github.com/sdsykes/fastimage/pull/115
+# has been merged. Please remove the specs as well.
+class FastImage
+  attr_reader :original_type
+
+  private
+
+  old_parse_type = instance_method(:parse_type)
+
+  define_method(:parse_type) do
+    @original_type = old_parse_type.bind(self).()
+
+    if @original_type == :svg && @stream.peek(2) == "<s"
+      raise UnknownImageType if @stream.peek(4) != "<svg"
+    end
+
+    @original_type
+  end
+end