Why Minify_CSS::minify and CssMin::minify

[adoerler]

Hi,

if cssFileCompile is enabled, each file configured in the asset gets minified (using Minify_CSS::minify) at:
https://github.com/skeeks-semenov/yii2-assets-auto-compress/blob/master/src/AssetsAutoCompressComponent.php#L534

If cssFileCompress is enabled, it will get minified a few lines later again (using CssMin::minify):
https://github.com/skeeks-semenov/yii2-assets-auto-compress/blob/master/src/AssetsAutoCompressComponent.php#L568

I think complie should only concatenate the asset files into a single CSS file and it should compress this single CSS file only once and only if cssFileCompress is enabled.

What do you think?
Andreas