using retina '@2x' and padding, but only @1x image has padding

[jinghaonode]

new SpritesmithPlugin({
src: {
cwd: path.resolve(__dirname, '../src/ico'),
glob: '*.png'
},
target: {
image: path.resolve(__dirname, '../src/assets/sprite.png'),
css: path.resolve(__dirname, '../src/assets/sprite.scss')
},
apiOptions: {
cssImageRef: '~@/assets/sprite.png'
},
retina: '@2x',
spritesmithOptions: {
algorithm: 'top-down',
padding: 20
},
})

[mixtur]

should be fixed in 0.5.2