Deep @extend specificity problems - continuation

[mgol]

Refs #592

The following SCSS:

.a {
    top: 0;
}

.b {
    .c {
        @extend .a;
    }
}

.d {
    > .e {
        @extend .a;
        @extend .c;
    }
}

is converted by Ruby Sass 3.4.13 to:

.a, .b .c, .b .d > .e, .d > .e {
  top: 0; }

libsass 3.2.0-beta.5 produces:

.a, .b .c, .d > .e {
  top: 0; }

EDIT: I simplified the test case.

[mgol]

Possibly related: #823

EDIT: but maybe not related; my test case looks a little different as it extends a class that is wrapped in another selector.

[xzyfer]

Spec added sass/sass-spec#322