Wrong file name / CSS Image

Hi,

we have just upgrade to v 2.2.1 and discovered the following:

It seems that AO is changing the filename if it includes a “color name” in the filename:

Original CSS:
.main-heading {background: #048ec7 url(/wp-content/themes/mytheme/assets/img/backgrounds/radial-gradient-white-top-20.png) no-repeat 50% 0;}

After AO Optimization:
.main-heading{background:#048ec7 url(https://cdn.example.net/wp-content/themes/mytheme/assets/img/backgrounds/radial-gradient-#fff-top-20.png) no-repeat 50% 0}

So the keyword WHITE in the filename has been replaced by the HTML color code.
This results in a 404 error.

Not a big problem for us (we simply changed the filename) but might be for others.

BTW: Your plugin ROCKS 🙂

Thank you and regards
C.