debug dataset sort

templates/repo/datasets/index.tmpl

@@ -69,7 +69,7 @@
             <div class="column">
               <h2>{{.i18n.Tr "datasets"}}</h2>
             </div>
-            <div class="column right aligned">
+            <div class="column right aligned" style="z-index:1">
               <div class="ui right dropdown type jump item">
                 <span class="text">
                   {{.i18n.Tr "repo.issues.filter_sort"}}<i class="dropdown icon"></i>