* stable: (26 commits) Deprecate working directory imports for stdin. Store line number in Sequence#line= Properly round in operator-based color operations. Be more explicit about immutable functions. Further improve rounding. English docs English docs Not HTTPS Updated IE filters reference link Update Natalie's website link on README Bump VERSION to 3.4.14. Fix script.css. Round, don't truncate, color operation results. Deprecate 1em != 1 as well. Fix @supports parsing and emitting. Make Rubocop happy. Get rid of "Relative to" and fix the plugin test. Fix tests and clean up import errors. Don't emit multiple unquote() warnings for the same line. Add a CHANGELOG entry. ...
The `scss-lint` project performs a number of static checks against SCSS code to find style offenses. `Sequence` objects were returning `nil` when calling `#line`. This was because `Sequence#line=` was not recording the actual line in an instance variable like `AbstractSequence`. Fix this by ensuring the line number is stored in `@line`. This will allow the `scss-lint` project to implement brigade/scss-lint#456
Although previously rounding was added for various color functions, it didn't extend to arithmetic operations. In addition to being philosophically inconsistent, this caused runs with and without mathn to behave differently, which broke the continuous integration.