ENGCOM-8407: Avoid binding magnifier events in duplicate on resize #30695

 - Merge Pull Request #30695 from fredden/magento2:magnifier-resize-performance
 - Merged commits:
   1. 6bec772
   2. 693e366
   3. 2bb781f

Author: magento-engcom-team

lib/web/magnifier/magnifier.js

@@ -401,6 +401,13 @@
         }
 
         function bindEvents(eType, thumb) {
+            var eventFlag = 'hasBoundEvent_' + eType;
+            if (thumb[eventFlag]) {
+                // Events are already bound, no need to bind in duplicate
+                return;
+            }
+            thumb[eventFlag] = true;
+
             switch (eType) {
                 case 'hover':
                     hoverEvents(thumb);