Auto merge of #25610 - pshaughn:abortfix, r=Manishearth

do less on abort if not done

Abort() was resetting state when it didn't need to, and possibly also not resetting as much of it as it needed to. I'm not sure if this is a completely correct fix but it passes some WPT tests.

---
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- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #24931

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- [X] There are tests for these change

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components/script/dom/xmlhttprequest.rs

@@ -758,7 +758,12 @@ impl XMLHttpRequestMethods for XMLHttpRequest {
             }
         }
         // Step 3
-        self.ready_state.set(XMLHttpRequestState::Unsent);
+        if self.ready_state.get() == XMLHttpRequestState::Done {
+            self.change_ready_state(XMLHttpRequestState::Unsent);
+            self.response_status.set(Err(()));
+            self.response.borrow_mut().clear();
+            self.response_headers.borrow_mut().clear();
+        }
     }
 
     // https://xhr.spec.whatwg.org/#the-responseurl-attribute
@@ -961,13 +966,15 @@ impl XMLHttpRequest {
     fn change_ready_state(&self, rs: XMLHttpRequestState) {
         assert_ne!(self.ready_state.get(), rs);
         self.ready_state.set(rs);
-        let event = Event::new(
-            &self.global(),
-            atom!("readystatechange"),
-            EventBubbles::DoesNotBubble,
-            EventCancelable::Cancelable,
-        );
-        event.fire(self.upcast());
+        if rs != XMLHttpRequestState::Unsent {
+            let event = Event::new(
+                &self.global(),
+                atom!("readystatechange"),
+                EventBubbles::DoesNotBubble,
+                EventCancelable::Cancelable,
+            );
+            event.fire(self.upcast());
+        }
     }
 
     fn process_headers_available(

tests/wpt/metadata/xhr/send-data-unexpected-tostring.htm.ini

@@ -1,8 +1,5 @@
 [send-data-unexpected-tostring.htm]
   type: testharness
-  [abort() called from data stringification]
-    expected: FAIL
-
   [open() called from data stringification]
     expected: FAIL