Autofill: re-set the field value if necessary (#182)

src/inject.js

@@ -409,6 +409,7 @@
         }
 
         // Set the field value
+        let initialValue = el.value || el.getAttribute("value");
         el.setAttribute("value", value);
         el.value = value;
 
@@ -417,6 +418,13 @@
             el.dispatchEvent(new Event(eventName, { bubbles: true }));
         }
 
+        // re-set value if unchanged after firing post-fill events
+        // (in case of sabotage by the site's own event handlers)
+        if ((el.value || el.getAttribute("value")) === initialValue) {
+            el.setAttribute("value", value);
+            el.value = value;
+        }
+
         // Finally unfocus the element
         el.dispatchEvent(new Event("blur", { bubbles: true }));
         return true;