FIX: improves share/invite behavior on mobile and especially iOS (#7416)

app/assets/javascripts/discourse/initializers/topic-footer-buttons.js.es6

@@ -1,5 +1,4 @@
 import showModal from "discourse/lib/show-modal";
-import { nativeShare } from "discourse/lib/pwa-utils";
 import { registerTopicFooterButton } from "discourse/lib/register-topic-footer-button";
 
 export default {
@@ -13,7 +12,6 @@ export default {
       label: "topic.share.title",
       title: "topic.share.help",
       action() {
-        const modal = () => {
         const panels = [
           {
             id: "share",
@@ -48,9 +46,6 @@ export default {
           modalClass: "share-and-invite",
           panels
         });
-        };
-
-        nativeShare({ url: this.get("topic.shareUrl") }).then(null, modal);
       },
       dropdown() {
         return this.site.mobileView;

app/assets/javascripts/discourse/lib/pwa-utils.js.es6

@@ -8,7 +8,7 @@ export function nativeShare(data) {
         .share(data)
         .then(resolve)
         .catch(e => {
-          if (e.message === "Share canceled") {
+          if (e.name === "AbortError") {
             // closing share panel do nothing
           } else {
             reject();