From 4b4ea122ad1a37317f88186371f66a08d7c63cb0 Mon Sep 17 00:00:00 2001
From: Quincy Morgan <quincy.morgan@icloud.com>
Date: Tue, 10 Dec 2019 13:42:11 -0500
Subject: [PATCH] Fix performance issue where breathe behavior would be called
 for each selected element instead of just for the surface (close #3571)

---
 modules/behavior/breathe.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/modules/behavior/breathe.js b/modules/behavior/breathe.js
index 406d4af57..74bc0aa72 100644
--- a/modules/behavior/breathe.js
+++ b/modules/behavior/breathe.js
@@ -126,12 +126,19 @@ export function behaviorBreathe() {
             _selected = currSelected.call(calcAnimationParams);
         }
 
+        var didCallNextRun = false;
+
         _selected
             .transition()
             .duration(duration)
             .call(setAnimationParams, fromTo)
             .on('end', function() {
-                surface.call(run, toFrom);
+                // `end` event is called for each selected element, but we want
+                // it to run only once
+                if (!didCallNextRun) {
+                    surface.call(run, toFrom);
+                    didCallNextRun = true;
+                }
             });
     }