Fix issue with css guards not hiding inner classes

test/css/css-guards.css

@@ -10,3 +10,9 @@
 .multiple-conditions-1 {
   color: red;
 }
+.inheritance .test {
+  color: black;
+}
+.inheritance:hover {
+  color: pink;
+}

test/less/css-guards.less

@@ -28,4 +28,37 @@
 
 @b: 2;
 @c: 3;
-@d: 3;
+@d: 3;
+
+.inheritance when (@b = 2) {
+  .test {
+    color: black;
+  }
+  &:hover {
+    color: pink;
+  }
+  .hideme when (@b = 1) {
+    color: green;
+  }
+  & when (@b = 1) {
+    hideme: green;
+  }
+}
+
+.hideme when (@b = 1) {
+  .test {
+    color: black;
+  }
+  &:hover {
+    color: pink;
+  }
+  .hideme when (@b = 1) {
+    color: green;
+  }
+}
+
+& when (@b = 1) {
+  .hideme {
+    color: red;
+  }
+}