From cc47ef56ec434d6352279d58eddbcab0dec12b9f Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Thu, 16 Nov 2017 15:06:28 +0100
Subject: [PATCH] Remove the `onclick` polyfill for old versions of Opera

This was only relevant for no obsolete versions Opera, that use the Presto engine. According to https://en.wikipedia.org/wiki/History_of_the_Opera_web_browser#Opera_2013, the last version affected was released in 2013.
---
 src/shared/compatibility.js | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/src/shared/compatibility.js b/src/shared/compatibility.js
index f762e76e9..2bfc74c0f 100644
--- a/src/shared/compatibility.js
+++ b/src/shared/compatibility.js
@@ -30,7 +30,6 @@ var isChrome = userAgent.indexOf('Chrom') >= 0;
 var isIOSChrome = userAgent.indexOf('CriOS') >= 0;
 var isIE = userAgent.indexOf('Trident') >= 0;
 var isIOS = /\b(iPad|iPhone|iPod)(?=;)/.test(userAgent);
-var isOpera = userAgent.indexOf('Opera') >= 0;
 var isSafari = /Safari\//.test(userAgent) &&
                !/(Chrome\/|Android\s)/.test(userAgent);
 
@@ -143,25 +142,6 @@ PDFJS.compatibilityChecked = true;
   });
 })();
 
-// Check onclick compatibility in Opera
-// Support: Opera<15
-(function checkOnClickCompatibility() {
-  // workaround for reported Opera bug DSK-354448:
-  // onclick fires on disabled buttons with opaque content
-  function ignoreIfTargetDisabled(event) {
-    if (isDisabled(event.target)) {
-      event.stopPropagation();
-    }
-  }
-  function isDisabled(node) {
-    return node.disabled || (node.parentNode && isDisabled(node.parentNode));
-  }
-  if (isOpera) {
-    // use browser detection since we cannot feature-check this bug
-    document.addEventListener('click', ignoreIfTargetDisabled, true);
-  }
-})();
-
 // Checks if possible to use URL.createObjectURL()
 // Support: IE, Chrome on iOS
 (function checkOnBlobSupport() {