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Mark XianandGitHub
0f24f11924
The `already()` check compared `before.selector` to the generated
prefixed selector with strict equality. Generated prefixed selectors
always join the comma list with `', '`, so once an existing prefixed
rule had its selector list reformatted (e.g. one selector per line by a
formatter), the comparison failed and Autoprefixer inserted a duplicate
prefixed rule on every run.
Normalize the compared selector with `list.comma(...).join(', ')` so
whitespace differences in the selector list no longer defeat the
duplication check.
Closes #1497