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Take in account selectors support in functional pseudo-classes #450
Description
Currently CSSO doesn't traverse selectors in functional pseudo-classes when build pseudoSignature which leads to the incorrect merge of rules, e.g.
.cc-expiry-month:not(:-moz-placeholder-shown) {
width: 42px;
}
.cc-expiry-month:not(:-ms-input-placeholder) {
width: 42px;
}
.cc-expiry-month:not(:placeholder-shown) {
width: 42px;
}Will produce the incorrect result (pretty printed):
.cc-expiry-month:not(:-moz-placeholder-shown),
.cc-expiry-month:not(:-ms-input-placeholder),
.cc-expiry-month:not(:placeholder-shown){
width:42px
}The correct output should not merge rules.
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