FIX: Hide form after password reset (#14526)

When hide_email_address_taken was disabled, the forgot password modal
showed a flash message and continued to display the form causing
confusion. This change shows the flash message only when an error occurs
and in all other cases it shows a success message and hides the form.

app/assets/javascripts/discourse/app/controllers/forgot-password.js

@@ -54,14 +54,23 @@ export default Controller.extend(ModalFunctionality, {
           const accountEmailOrUsername = escapeExpression(
             this.accountEmailOrUsername
           );
-          const isEmail = accountEmailOrUsername.match(/@/);
-          let key = `forgot_password.complete_${
-            isEmail ? "email" : "username"
-          }`;
-          let extraClass;
 
-          if (data.user_found === true) {
+          let key = "forgot_password.complete";
-            key += "_found";
+          key += accountEmailOrUsername.match(/@/) ? "_email" : "_username";
+
+          if (data.user_found === false) {
+            key += "_not_found";
+
+            this.flash(
+              I18n.t(key, {
+                email: accountEmailOrUsername,
+                username: accountEmailOrUsername,
+              }),
+              "error"
+            );
+          } else {
+            key += data.user_found ? "_found" : "";
+
             this.set("accountEmailOrUsername", "");
             this.set(
               "offerHelp",
@@ -70,19 +79,7 @@ export default Controller.extend(ModalFunctionality, {
                 username: accountEmailOrUsername,
               })
             );
-          } else {
+            this.set("helpSeen", !data.user_found);
-            if (data.user_found === false) {
-              key += "_not_found";
-              extraClass = "error";
-            }
-
-            this.flash(
-              I18n.t(key, {
-                email: accountEmailOrUsername,
-                username: accountEmailOrUsername,
-              }),
-              extraClass
-            );
           }
         })
         .catch((e) => {

app/assets/javascripts/discourse/tests/acceptance/forgot-password-test.js

@@ -85,3 +85,37 @@ acceptance("Forgot password", function (needs) {
     );
   });
 });
+
+acceptance(
+  "Forgot password - hide_email_address_taken enabled",
+  function (needs) {
+    needs.pretender((server, helper) => {
+      server.post("/session/forgot_password", () => {
+        return helper.response({});
+      });
+    });
+
+    test("requesting password reset", async function (assert) {
+      await visit("/");
+      await click("header .login-button");
+      await click("#forgot-password-link");
+
+      assert.equal(
+        queryAll(".forgot-password-reset").attr("disabled"),
+        "disabled",
+        "it should disable the button until the field is filled"
+      );
+
+      await fillIn("#username-or-email", "someuser");
+      await click(".forgot-password-reset");
+
+      assert.equal(
+        queryAll(".modal-body").html().trim(),
+        I18n.t("forgot_password.complete_username", {
+          username: "someuser",
+        }),
+        "it should display a success message"
+      );
+    });
+  }
+);