Fix tabs when bubbling feature blocks

Author: mgreter

cssize.cpp

@@ -268,6 +268,8 @@ namespace Sass {
                                                     m->feature_queries(),
                                                     wrapper_block);
 
+    mm->tabs(m->tabs());
+
     Bubble* bubble = new (ctx.mem) Bubble(mm->pstate(), mm);
     return bubble;
   }

inspect.cpp

@@ -58,14 +58,10 @@ namespace Sass {
   void Inspect::operator()(Bubble* bubble)
   {
     append_indentation();
-    append_token("Bubble", bubble);
-    append_optional_space();
-    append_string("(");
-    append_optional_space();
+    append_token("::BUBBLE", bubble);
+    append_scope_opener();
     bubble->node()->perform(this);
-    append_optional_space();
-    append_string(")");
-    append_optional_space();
+    append_scope_closer();
   }
 
   void Inspect::operator()(Media_Block* media_block)