FIX: allow pasting links into title field that are longer than the max title length

app/assets/javascripts/discourse/components/composer-title.js.es6

@@ -31,6 +31,13 @@ export default Ember.Component.extend({
     }
   },
 
+  @computed('watchForLink')
+  titleMaxLength() {
+    // maxLength gets in the way of pasting long links, so don't use it if featured links are allowed.
+    // Validation will display a message if titles are too long.
+    return this.get('watchForLink') ? null : this.siteSettings.max_topic_title_length;
+  },
+
   @observes('composer.titleLength', 'watchForLink')
   _titleChanged() {
     if (this.get('composer.titleLength') === 0) { this.set('autoPosted', false); }

app/assets/javascripts/discourse/templates/components/composer-title.hbs

@@ -1,7 +1,7 @@
 {{text-field value=composer.title
              tabindex="2"
              id="reply-title"
-             maxLength=siteSettings.max_topic_title_length
+             maxLength=titleMaxLength
              placeholderKey=composer.titlePlaceholder
              disabled=composer.loading}}
 

test/javascripts/acceptance/composer-topic-links-test.js.es6

@@ -3,7 +3,8 @@ import { acceptance } from "helpers/qunit-helpers";
 acceptance("Composer topic featured links", {
   loggedIn: true,
   settings: {
-    topic_featured_link_enabled: true
+    topic_featured_link_enabled: true,
+    max_topic_title_length: 80
   }
 });
 
@@ -52,3 +53,14 @@ test("ignore internal links", () => {
     equal(find('.title-input input').val(), title, "title is unchanged");
   });
 });
+
+test("link is longer than max title length", () => {
+  visit("/");
+  click('#create-topic');
+  fillIn('#reply-title', "http://www.example.com/has-title-and-a-url-that-is-more-than-80-characters-because-thats-good-for-seo-i-guess.html");
+  andThen(() => {
+    ok(find('.d-editor-preview').html().trim().indexOf('onebox') > 0, "it pastes the link into the body and previews it");
+    ok(exists('.d-editor-textarea-wrapper .popup-tip.good'), 'the body is now good');
+    equal(find('.title-input input').val(), "An interesting article", "title is from the oneboxed article");
+  });
+});

test/javascripts/helpers/create-pretender.js.es6

@@ -335,7 +335,7 @@ export default function() {
     this.delete('/admin/badges/:id', success);
 
     this.get('/onebox', request => {
-      if (request.queryParams.url === 'http://www.example.com/has-title.html') {
+      if (request.queryParams.url.startsWith('http://www.example.com/has-title')) {
         return [
           200,
           {"Content-Type": "application/html"},