MAGETWO-32245: Horizontal scroll is displayed to each category with long name

Author: Natalia Momotenko

app/design/adminhtml/Magento/backend/web/css/admin.less

@@ -1405,10 +1405,6 @@ address {
     background-image: url(../images/fam_application_form_delete.png);
 }
 
-.x-tree-node {
-    overflow: auto;
-}
-
 /*
     Styles for "js" tooltip with positionings
 -------------------------------------- */

app/design/adminhtml/Magento/backend/web/less/styles/debug.less

@@ -602,6 +602,16 @@
     line-height: 28px;
 }
 
+.rule-tree .fieldset {
+    min-width: 0; // Fixed Chrome fieldset issue
+}
+
+@-moz-document url-prefix() { // Fixed Firefox fieldset issue
+    .rule-tree .fieldset {
+        display: table-cell;
+    }
+}
+
 .rule-tree ul {
     list-style: none;
     padding-left: 16px;
@@ -675,6 +685,7 @@
     border: solid 1px #CCC;
     margin: 20px;
     padding: 15px 10px 5px;
+    overflow: auto;
 }
 
 .rule-param-wait {