Still support -append in MiniMagick

Author: janko

lib/image_processing/mini_magick.rb

@@ -157,7 +157,11 @@ def limits(options)
 
       # Appends a raw ImageMagick command-line argument to the command.
       def append(*args)
-        magick.merge! args
+        if args.empty?
+          magick.append
+        else
+          magick.merge! args
+        end
       end
 
       private

test/mini_magick_test.rb

@@ -597,5 +597,10 @@
 
       assert_similar expected, actual
     end
+
+    it "still supports -append" do
+      result = ImageProcessing::MiniMagick.append("wizard:").append.call(@portrait)
+      assert_dimensions [600, 1440], result
+    end
   end
 end