Bypass Firefox (iOS) bug (#20244) (#20250)

Backport #20244 

* https://github.com/go-gitea/gitea/issues/20240

At the moment, Firefox (iOS) (10x) has an engine bug. See https://github.com/go-gitea/gitea/issues/20240
If a script inserts a newly created (and content changed) element into DOM, there will be a nonsense error event reporting: Script error: line 0, col 0.

This PR ignores such nonsense error event.

Fix #20240

web_src/js/bootstrap.js

@@ -20,6 +20,11 @@ export function showGlobalErrorMessage(msg) {
  * @param {ErrorEvent} e
  */
 function processWindowErrorEvent(e) {
+  if (!e.error && e.lineno === 0 && e.colno === 0 && e.filename === '' && window.navigator.userAgent.includes('FxiOS/')) {
+    // At the moment, Firefox (iOS) (10x) has an engine bug. See https://github.com/go-gitea/gitea/issues/20240
+    // If a script inserts a newly created (and content changed) element into DOM, there will be a nonsense error event reporting: Script error: line 0, col 0.
+    return; // ignore such nonsense error event
+  }
   showGlobalErrorMessage(`JavaScript error: ${e.message} (${e.filename} @ ${e.lineno}:${e.colno}). Open browser console to see more details.`);
 }