[openstreetmap/openstreetmap-website] Add unsaved changes warning to message and diary forms (PR #7076)

[Tom Hughes]

@tomhughes commented on this pull request.



> @@ -0,0 +1,48 @@
+(function () {
+  function beforeUnloadListener(event) {
+    event.preventDefault();
+    // Legacy support for older browsers.
+    event.returnValue = true;
+  };
+
+  // A function that adds a `beforeunload` listener if there are unsaved changes.

Do we have any history of using jsdoc comments? I'm not sure it's reasonable to suddenly start demanding them if we haven't normally used them...

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