Double class name in selector

[kirill-konshin]

When LESS version of Twitter Bootstrap is wrapped with a class:

.Bootstrap {
    @import "bower_components/bootstrap/less/bootstrap";
}

It produces:

.Bootstrap .Bootstrap .nav:before,
.Bootstrap .Bootstrap .nav:after {
  content: " ";
  display: table;
}

All other definitions are correctly wrapped with only one .Bootstrap class.

Definition of .nav:

.nav {
  &:extend(.clearfix all);

...

.clearfix() {
  &:before,
  &:after {
    content: " "; // 1
    display: table; // 2
  }
  &:after {
    clear: both;
  }
}

[seven-phases-max]

See #2052 (and #1850 for more details).

[seven-phases-max]

Closing as duplicate of #2052.