From e2a239bf802892afed5854149485039b51628b35 Mon Sep 17 00:00:00 2001
From: Eric Vicenti <ericvicenti@users.noreply.github.com>
Date: Thu, 5 Apr 2018 11:27:32 -0700
Subject: [PATCH] avoid unnecessary navigation completion dispatches (#3902)

---
 .../src/views/StackView/StackView.js          | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/packages/react-navigation/src/views/StackView/StackView.js b/packages/react-navigation/src/views/StackView/StackView.js
index f6dcfcf3..952c1020 100644
--- a/packages/react-navigation/src/views/StackView/StackView.js
+++ b/packages/react-navigation/src/views/StackView/StackView.js
@@ -25,14 +25,19 @@ class StackView extends React.Component {
         navigation={this.props.navigation}
         descriptors={this.props.descriptors}
         onTransitionStart={this.props.onTransitionStart}
-        onTransitionEnd={(lastTransition, transition) => {
+        onTransitionEnd={(transition, lastTransition) => {
           const { onTransitionEnd, navigation } = this.props;
-          navigation.dispatch(
-            StackActions.completeTransition({
-              key: navigation.state.key,
-            })
-          );
-          onTransitionEnd && onTransitionEnd(lastTransition, transition);
+          if (
+            transition.navigation.state.isTransitioning &&
+            !lastTransition.navigation.state.isTransitioning
+          ) {
+            navigation.dispatch(
+              StackActions.completeTransition({
+                key: navigation.state.key,
+              })
+            );
+          }
+          onTransitionEnd && onTransitionEnd(transition, lastTransition);
         }}
       />
     );