[Sass] [SCSS] Make sure multiple adjacent silent Sass comments count as a single block.

lib/sass/engine.rb

@@ -301,6 +301,7 @@ MSG
 
     def append_children(parent, children, root)
       continued_rule = nil
+      continued_comment = nil
       children.each do |line|
         child = build_tree(parent, line, root)
 
@@ -323,6 +324,17 @@ MSG
           continued_rule, child = nil, continued_rule
         end
 
+        if child.is_a?(Tree::CommentNode) && child.silent
+          if continued_comment &&
+              child.line == continued_comment.line +
+              continued_comment.value.count("\n") + 1
+            continued_comment.value << "\n" << child.value
+            next
+          end
+
+          continued_comment = child
+        end
+
         check_for_no_children(child)
         validate_and_append_child(parent, child, line, root)
       end

test/sass/conversion_test.rb

@@ -252,6 +252,24 @@ SASS
 foo bar {
   a: b; }
 SCSS
+
+    assert_sass_to_scss <<SCSS, <<SASS
+// foo
+// bar
+//   baz
+// bang
+
+foo bar {
+  a: b; }
+SCSS
+// foo
+// bar
+//   baz
+// bang
+
+foo bar
+  a: b
+SASS
   end
 
   def test_loud_comments