From 5c003c491eb5ba18a7ac75382b5c402db4b32931 Mon Sep 17 00:00:00 2001
From: Ilya Shishkin <ilshishkin@gmail.com>
Date: Wed, 16 Dec 2020 16:38:08 +0300
Subject: [PATCH 1/2] fix(autocomplete): prevent flashing of invalid state

- when user clicks on suggestion, input element lost focus and then programmatically get focused
- again, add stop immediate propogation to prevent blur event handling by other handlers which
- update ng-model validity state

Fixes #10975
---
 src/components/autocomplete/js/autocompleteController.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/components/autocomplete/js/autocompleteController.js b/src/components/autocomplete/js/autocompleteController.js
index a3b8ffd2b05..fa0234d5cbf 100644
--- a/src/components/autocomplete/js/autocompleteController.js
+++ b/src/components/autocomplete/js/autocompleteController.js
@@ -601,6 +601,8 @@ function MdAutocompleteCtrl ($scope, $element, $mdUtil, $mdConstant, $mdTheming,
     if (!noBlur) {
       ctrl.hidden = shouldHide();
       evalAttr('ngBlur', { $event: $event });
+    } else {
+      $event.stopImmediatePropagation();
     }
   }
 

From 02f6f8db07c7def3e9c196529915a70f3b6e7787 Mon Sep 17 00:00:00 2001
From: Ilya Shishkin <ilshishkin@gmail.com>
Date: Thu, 17 Dec 2020 12:31:58 +0300
Subject: [PATCH 2/2] fix(autocomplete): add check that the event is an object

- function blur most often called without an argument

Fixes #10975
---
 src/components/autocomplete/js/autocompleteController.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/components/autocomplete/js/autocompleteController.js b/src/components/autocomplete/js/autocompleteController.js
index fa0234d5cbf..6224f7d6391 100644
--- a/src/components/autocomplete/js/autocompleteController.js
+++ b/src/components/autocomplete/js/autocompleteController.js
@@ -594,6 +594,7 @@ function MdAutocompleteCtrl ($scope, $element, $mdUtil, $mdConstant, $mdTheming,
 
   /**
    * Handles input blur event, determines if the dropdown should hide.
+   * @param {Event=} $event
    */
   function blur($event) {
     hasFocus = false;
@@ -601,7 +602,7 @@ function MdAutocompleteCtrl ($scope, $element, $mdUtil, $mdConstant, $mdTheming,
     if (!noBlur) {
       ctrl.hidden = shouldHide();
       evalAttr('ngBlur', { $event: $event });
-    } else {
+    } else if (angular.isObject($event)) {
       $event.stopImmediatePropagation();
     }
   }