CachedFilesMixin does not rewrite rules for css selector with path

[mike@…]

Using CachedFilesMixin we'll have paths like this
<img alt="True" src="/media/static/admin/img/icon-yes.0596085e212f.gif">
after template rendering, but an unmodified selector:
img[src$="admin/img/icon-yes.gif"] in processed stylesheet.

This happens because CachedFilesMixin.patterns does not contain a rule like this """(img\[src[\^\$\*]{0,1}=\s*["']\s*(.*?)["'])""" to match against and actually can not deal with ^=|$=|*= operators. I am not sure how such paths can be properly processed, though.

[Anssi Kääriäinen]

Totally out of my expertise area, but seems valid.

[Mariusz Felisiak]

This issue is not valid anymore because CachedFilesMixin and CachedStaticFilesStorage will be removed in Django 3.1 (see f1894bae3071da4ee577fc40ae61491f3e03d82c) and an eventual patch doesn't qualify for a backport.