Prefer cloned root specifier inside media query

Author: dqbd

lib/resolve-decl.js

@@ -39,7 +39,7 @@ function eachMapItemDependencyOfDecl(variablesUsedList, map, decl, cb) {
 				// Splice on where the selector starts matching the selector inside at-rule
 				// See: `test/fixtures/cascade-on-nested-rules.css`
 				var varDeclAtRule = mapItem.parent.parent;
-				mimicDecl = cloneSpliceParentOntoNodeWhen(decl, varDeclAtRule, function(ancestor) {
+				mimicDecl = cloneSpliceParentOntoNodeWhen(mimicDecl || decl, varDeclAtRule, function(ancestor) {
 					return ancestor === nodeToSpliceParentOnto;
 				});