lib/chunky_png/canvas/operations.rb in chunky_png-1.3.2 vs lib/chunky_png/canvas/operations.rb in chunky_png-1.3.3

@@ -175,10 +175,10 @@
           raise ChunkyPNG::OutOfBounds, 'Original image height is too small!'
         end
 
         new_pixels = []
         for cy in 0...crop_height do
-          new_pixels += pixels.slice((cy + y) * width + x, crop_width)
+          new_pixels.concat pixels.slice((cy + y) * width + x, crop_width)
         end
         replace_canvas!(crop_width, crop_height, new_pixels)
       end
 
       # Flips the image horizontally, leaving the original intact.