FEATURE: Warn if invited user cannot see topic (#13548)

Users can invite people to topics from secured category, but they will
not be redirected to the topic after signing up unless they have the
permissions to view the topic. This commit shows a warning when invite
is saved if the topic is in a secured category and none of the invite
groups are allowed to see it.

app/assets/javascripts/discourse/app/components/d-modal-body.js

@@ -62,7 +62,12 @@ export default Component.extend({
     const modalAlert = document.getElementById("modal-alert");
     if (modalAlert) {
       modalAlert.style.display = "none";
-      modalAlert.classList.remove("alert-info", "alert-error", "alert-success");
+      modalAlert.classList.remove(
+        "alert-error",
+        "alert-info",
+        "alert-success",
+        "alert-warning"
+      );
     }
   },
 

app/assets/javascripts/discourse/app/controllers/create-invite.js

@@ -99,10 +99,15 @@ export default Controller.extend(
 
       return this.invite
         .save(data)
-        .then(() => {
+        .then((result) => {
           this.rollbackBuffer();
           this.setAutogenerated(opts.autogenerated);
-          if (!this.autogenerated) {
+          if (result.warnings) {
+            this.appEvents.trigger("modal-body:flash", {
+              text: result.warnings.join(","),
+              messageClass: "warning",
+            });
+          } else if (!this.autogenerated) {
             if (this.isEmail && opts.sendEmail) {
               this.send("closeModal");
             } else {