Use workaround from Ace's commits.

services/web/public/js/ace-1.2.5/ace.js

@@ -1350,11 +1350,6 @@ if (typeof navigator != "object")
 
 var os = (navigator.platform.match(/mac|win|linux/i) || ["other"])[0].toLowerCase();
 var ua = navigator.userAgent;
-
-var safariRegex = /version\/([\w\.]+).+?(mobile\s?safari|safari)/i;
-var safariResult = ua.match(safariRegex);
-var safariVersion = safariResult ? parseFloat(safariResult[1]) : 0;
-
 exports.isWin = (os == "win");
 exports.isMac = (os == "mac");
 exports.isLinux = (os == "linux");
@@ -1371,8 +1366,6 @@ exports.isWebKit = parseFloat(ua.split("WebKit/")[1]) || undefined;
 
 exports.isChrome = parseFloat(ua.split(" Chrome/")[1]) || undefined;
 
-exports.isSafari = safariVersion || undefined;
-
 exports.isAIR = ua.indexOf("AdobeAIR") >= 0;
 
 exports.isIPad = ua.indexOf("iPad") >= 0;
@@ -2290,9 +2283,13 @@ var TextInput = function(parentNode, host) {
         if (e.type == "compositionend" && c.range) {
             host.selection.setRange(c.range);
         }
-        // WORKAROUND: Accent keys and Korean keys don't work in Chrome >53.
-        // https://github.com/ajaxorg/ace/issues/3045
-        if (useragent.isChrome >= 53 || useragent.isSafari >= 10.1) onInput();
+        var needsOnInput =
+            (!!useragent.isChrome && useragent.isChrome >= 53) ||
+            (!!useragent.isWebKit && useragent.isWebKit >= 603);
+
+        if (needsOnInput) {
+          onInput();
+        }
     };