Merge pull request twbs#18253 from twbs/mdo-patch-1

Ensure proper z-indexing in input-groups

Author: mdo

less/input-groups.less

@@ -29,6 +29,10 @@
 
     width: 100%;
     margin-bottom: 0;
+    
+    &:focus {
+      z-index: 3;
+    }
   }
 }