From b36b92b2478b5aac165be0d3d84cd1f011d4c8df Mon Sep 17 00:00:00 2001
From: nskazki <nskazki@gmail.com>
Date: Fri, 19 Jul 2019 16:12:16 +0300
Subject: [PATCH] Detach event listeners on destroy

if "on" receives "this", it attaches "eventListeners" array to "this" and stores "{ element, type, callback }" hash in there.
later, during the destruction process, all the entries from this array will be processed by "unbindListeners" helper to detach all the event listeners.
---
 src/js/controls.js | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/js/controls.js b/src/js/controls.js
index 7afcd2c0..b5b2d00a 100644
--- a/src/js/controls.js
+++ b/src/js/controls.js
@@ -402,7 +402,8 @@ const controls = {
     // https://bugzilla.mozilla.org/show_bug.cgi?id=1220143
     bindMenuItemShortcuts(menuItem, type) {
         // Navigate through menus via arrow keys and space
-        on(
+        on.call(
+            this,
             menuItem,
             'keydown keyup',
             event => {
@@ -452,7 +453,7 @@ const controls = {
 
         // Enter will fire a `click` event but we still need to manage focus
         // So we bind to keyup which fires after and set focus here
-        on(menuItem, 'keyup', event => {
+        on.call(this, menuItem, 'keyup', event => {
             if (event.which !== 13) {
                 return;
             }
@@ -1463,7 +1464,7 @@ const controls = {
                     bindMenuItemShortcuts.call(this, menuItem, type);
 
                     // Show menu on click
-                    on(menuItem, 'click', () => {
+                    on.call(this, menuItem, 'click', () => {
                         showMenuPanel.call(this, type, false);
                     });
 
@@ -1515,7 +1516,8 @@ const controls = {
                     );
 
                     // Go back via keyboard
-                    on(
+                    on.call(
+                        this,
                         pane,
                         'keydown',
                         event => {
@@ -1535,7 +1537,7 @@ const controls = {
                     );
 
                     // Go back via button click
-                    on(backButton, 'click', () => {
+                    on.call(this, backButton, 'click', () => {
                         showMenuPanel.call(this, 'home', false);
                     });