Drop support for Internet Explorer (#1313)

WordPress abandoned the support of IE with WP5.8 in July 2021.
https://wordpress.org/news/2021/05/dropping-support-for-internet-explorer-11/

Though we don't require that version of WP, it's time to abandon
that legacy. See also this very old ticket: #32.

1) Remove workaround for `RegExp:@@split`
See also https://caniuse.com/mdn-javascript_builtins_regexp_--split

2) Add more debug info about browser in the troubleshooting section.

js/core/qblocks.js

@@ -7,26 +7,9 @@ const qTranslateConfig = window.qTranslateConfig;
 export const qtranxj_get_split_blocks = function (text) {
     const regex = '(<!--:lang-->|<!--:-->|\\[:lang]|\\[:]|{:lang}|{:})'.replace(/lang/g, qTranslateConfig.lang_code_format);
     const splitRegex = new RegExp(regex, "gi");
-
-    // Most browsers support RegExp.prototype[@@split]()... except IE
-    if ('a~b'.split(/(~)/).length === 3) {
-        return text.split(splitRegex);
-    }
-
-    // compatibility for unsupported engines
-    let start = 0, arr = [];
-    let result;
-    while ((result = splitRegex.exec(text)) != null) {
-        arr.push(text.slice(start, result.index));
-        if (result.length > 1)
-            arr.push(result[1]);
-        start = splitRegex.lastIndex;
-    }
-    if (start < text.length)
-        arr.push(text.slice(start));
-    if (start === text.length)
-        arr.push(''); // delimiter at the end
-    return arr;
+    // Most browsers support RegExp.prototype[@@split]()... except IE (see debug info from troubleshooting)
+    // https://caniuse.com/mdn-javascript_builtins_regexp_--split
+    return text.split(splitRegex);
 };
 
 export const qtranxj_split = function (text) {

js/options.js

@@ -71,9 +71,12 @@ $(function () {
 
     $('#qtranxs_debug_query').on('click', function () {
         const cookies = document.cookie.split(';');
+        // Check "RegExp: @@split" support, see also: https://caniuse.com/mdn-javascript_builtins_regexp_--split
+        const isRegexSplitSupported = ('a~b'.split(/(~)/).length === 3);
         const browserInfo = {
             'cookies': [],
-            'navigator': navigator.userAgent
+            'navigator': navigator.userAgent,
+            'Javascript built-in RegExp: @@split': isRegexSplitSupported ? 'supported' : 'not supported!',
         };
         for (let i = 0; i < cookies.length; i++) {
             const cookieStr = cookies[i].trim();
@@ -82,10 +85,13 @@ $(function () {
             }
         }
 
-        $('#qtranxs_debug_info').show();
+        if (!isRegexSplitSupported) {
+            $('#qtranxs_debug_info_browser').css('color', 'red');
+        }
         $('#qtranxs_debug_info_browser').val(JSON.stringify(browserInfo, null, 2));
         $('#qtranxs_debug_info_versions').val('...');
         $('#qtranxs_debug_info_configuration').val('...');
+        $('#qtranxs_debug_info').show();
 
         $.ajax({
             url: ajaxurl,

package.json

@@ -26,7 +26,7 @@
     "@babel/core": "^7.21.4",
     "@babel/preset-env": "^7.21.4",
     "babel-loader": "^9.1.2",
-    "webpack": "^5.76.2",
+    "webpack": "^5.78.0",
     "webpack-cli": "^5.0.1"
   },
   "dependencies": {}