Fixing line-height of list items in tree view.

IPython/html/static/style/ipython.min.css

@@ -30,6 +30,7 @@
 .list_container>div{border-bottom:1px solid #ababab;}.list_container>div:hover .list-item{background-color:red;}
 .list_container>div:last-child{border:none;}
 .list_item:hover .list_item{background-color:#ddd;}
+.item_name{line-height:24px;}
 .list_container>div>span,.list_container>div>div{padding:8px;}
 .list_item a{text-decoration:none;}
 input.nbname_input{height:15px;}

IPython/html/static/style/style.min.css

@@ -1411,6 +1411,7 @@ span#login_widget{float:right;}
 .list_container>div{border-bottom:1px solid #ababab;}.list_container>div:hover .list-item{background-color:red;}
 .list_container>div:last-child{border:none;}
 .list_item:hover .list_item{background-color:#ddd;}
+.item_name{line-height:24px;}
 .list_container>div>span,.list_container>div>div{padding:8px;}
 .list_item a{text-decoration:none;}
 input.nbname_input{height:15px;}

IPython/html/static/tree/less/tree.less

@@ -50,6 +50,10 @@
   };
 }
 
+.item_name {
+    line-height: 24px;
+}
+
 .list_container > div > span, .list_container > div > div {
   padding: 8px;
 }