This is an update to the original fixes proposed in #647 without dist/ files based off the latest ui-select v0.14.9 release.

Author: ravishivt

src/uiSelectController.js

@@ -223,7 +223,11 @@ uis.controller('uiSelectCtrl',
         ctrl.setItemsFn(data);
       }else{
         if ( data !== undefined ) {
-          var filteredItems = data.filter(function(i) {return selectedItems && selectedItems.indexOf(i) < 0;});
+          var filteredItems = data.filter(function(i) {
+            return selectedItems.every(function(selectedItem) {
+              return !angular.equals(i, selectedItem);
+            });
+          });
           ctrl.setItemsFn(filteredItems);
         }
       }

src/uiSelectMultipleDirective.js

@@ -299,9 +299,19 @@ uis.directive('uiSelectMultiple', ['uiSelectMinErr','$timeout', function(uiSelec
               stashArr = stashArr.slice(1,stashArr.length);
             }
             newItem = $select.tagging.fct($select.search);
-            newItem.isTag = true;
-            // verify the the tag doesn't match the value of an existing item
-            if ( stashArr.filter( function (origItem) { return angular.equals( origItem, $select.tagging.fct($select.search) ); } ).length > 0 ) {
+            // verify the new tag doesn't match the value of a possible selection choice or an already selected item.
+            if (
+              stashArr.some(function (origItem) {
+                 return angular.equals(origItem, $select.tagging.fct($select.search));
+              }) ||
+              $select.selected.some(function (origItem) {
+                return angular.equals(origItem, newItem);
+              })
+            ) {
+              scope.$evalAsync(function () {
+                $select.activeIndex = 0;
+                $select.items = items;
+              });
               return;
             }
             newItem.isTag = true;