Bug 1350264 - Allow users to re-enable form autofill feature after all populated fields were cleared manually, r=lchang

MozReview-Commit-ID: DG31YXJuT2t

--HG--
extra : rebase_source : 2a027b4d8ccdf0b385454783901dece914003623

browser/extensions/formautofill/FormAutofillHandler.jsm

@@ -185,10 +185,11 @@ FormAutofillHandler.prototype = {
         hasFilledFields |= (fieldDetail.state == "AUTO_FILLED");
       }
 
-      // Unregister listeners once no field is in AUTO_FILLED state.
+      // Unregister listeners and clear guid once no field is in AUTO_FILLED state.
       if (!hasFilledFields) {
         this.form.rootElement.removeEventListener("input", onChangeHandler);
         this.form.rootElement.removeEventListener("reset", onChangeHandler);
+        this.filledProfileGUID = null;
       }
     };
 

browser/extensions/formautofill/test/mochitest/test_basic_autocomplete_form.html

@@ -164,6 +164,18 @@ add_task(async function check_fallback_after_form_autofill() {
   checkMenuEntries(["1-234-567-890"]);
 });
 
+// Resume form autofill once all the autofilled fileds are changed.
+add_task(async function check_form_autofill_resume() {
+  document.querySelector("#tel").blur();
+  document.querySelector("#form1").reset();
+  await setInput("#tel", "");
+  doKey("down");
+  await expectPopup();
+  checkMenuEntries(MOCK_STORAGE.map(address =>
+    JSON.stringify({primary: address.tel, secondary: address["street-address"]})
+  ));
+});
+
 registerPopupShownListener(popupShownListener);
 
 </script>