FEATURE: Allow scoping search to tag (#8345)

* When viewing a tag, the search widget will now show a checkbox to scope the search by tag, which will limit search results to that tag on desktop and mobile

test/javascripts/acceptance/search-test.js.es6

@@ -50,6 +50,14 @@ QUnit.test("search for a tag", async assert => {
 });
 
 QUnit.test("search scope checkbox", async assert => {
+  await visit("/tags/important");
+  await click("#search-button");
+  assert.ok(
+    exists(".search-context input:checked"),
+    "scope to tag checkbox is checked"
+  );
+  await click("#search-button");
+
   await visit("/c/bug");
   await click("#search-button");
   assert.ok(

test/javascripts/fixtures/discovery_fixtures.js.es6

@@ -3756,6 +3756,113 @@ export default {
       ]
     }
   },
+  "/tags/important/l/latest.json": {
+    users: [{ id: 1, username: "sam", avatar_template: "/images/avatar.png" }],
+    primary_groups: [],
+    topic_list: {
+      can_create_topic: true,
+      draft: null,
+      draft_key: "new_topic",
+      draft_sequence: 4,
+      per_page: 30,
+      tags: [
+        {
+          id: 1,
+          name: "test",
+          topic_count: 2,
+          staff: false
+        }
+      ],
+      topics: [
+        {
+          id: 16,
+          title: "Dinosaurs are the best",
+          fancy_title: "Dinosaurs are the best",
+          slug: "dinosaurs-are-the-best",
+          posts_count: 1,
+          reply_count: 0,
+          highest_post_number: 1,
+          image_url: null,
+          created_at: "2019-11-12T05:19:52.300Z",
+          last_posted_at: "2019-11-12T05:19:52.848Z",
+          bumped: true,
+          bumped_at: "2019-11-12T05:19:52.848Z",
+          unseen: false,
+          last_read_post_number: 1,
+          unread: 0,
+          new_posts: 0,
+          pinned: false,
+          unpinned: null,
+          visible: true,
+          closed: false,
+          archived: false,
+          notification_level: 3,
+          bookmarked: false,
+          liked: false,
+          tags: ["test"],
+          views: 2,
+          like_count: 0,
+          has_summary: false,
+          archetype: "regular",
+          last_poster_username: "sam",
+          category_id: 1,
+          pinned_globally: false,
+          featured_link: null,
+          posters: [
+            {
+              extras: "latest single",
+              description: "Original Poster, Most Recent Poster",
+              user_id: 1,
+              primary_group_id: null
+            }
+          ]
+        },
+        {
+          id: 15,
+          title: "This is a test tagged post",
+          fancy_title: "This is a test tagged post",
+          slug: "this-is-a-test-tagged-post",
+          posts_count: 1,
+          reply_count: 0,
+          highest_post_number: 1,
+          image_url: null,
+          created_at: "2019-11-12T05:19:32.032Z",
+          last_posted_at: "2019-11-12T05:19:32.516Z",
+          bumped: true,
+          bumped_at: "2019-11-12T05:19:32.516Z",
+          unseen: false,
+          last_read_post_number: 1,
+          unread: 0,
+          new_posts: 0,
+          pinned: false,
+          unpinned: null,
+          visible: true,
+          closed: false,
+          archived: false,
+          notification_level: 3,
+          bookmarked: false,
+          liked: false,
+          tags: ["test"],
+          views: 1,
+          like_count: 0,
+          has_summary: false,
+          archetype: "regular",
+          last_poster_username: "sam",
+          category_id: 3,
+          pinned_globally: false,
+          featured_link: null,
+          posters: [
+            {
+              extras: "latest single",
+              description: "Original Poster, Most Recent Poster",
+              user_id: 1,
+              primary_group_id: null
+            }
+          ]
+        }
+      ]
+    }
+  },
   "/c/feature/l/latest.json": {
     users: [
       { id: 1, username: "sam", avatar_template: "/images/avatar.png" },

test/javascripts/lib/search-test.js.es6

@@ -1,4 +1,7 @@
-import { translateResults } from "discourse/lib/search";
+import {
+  translateResults,
+  searchContextDescription
+} from "discourse/lib/search";
 
 QUnit.module("lib:search");
 
@@ -31,3 +34,27 @@ QUnit.test("unescapesEmojisInBlurbs", assert => {
   assert.ok(blurb.indexOf("<img src") === 0);
   assert.ok(blurb.indexOf(":thinking:") === -1);
 });
+
+QUnit.test("searchContextDescription", assert => {
+  assert.equal(
+    searchContextDescription("topic"),
+    I18n.t("search.context.topic")
+  );
+  assert.equal(
+    searchContextDescription("user", "silvio.dante"),
+    I18n.t("search.context.user", { username: "silvio.dante" })
+  );
+  assert.equal(
+    searchContextDescription("category", "staff"),
+    I18n.t("search.context.category", { category: "staff" })
+  );
+  assert.equal(
+    searchContextDescription("tag", "important"),
+    I18n.t("search.context.tag", { tag: "important" })
+  );
+  assert.equal(
+    searchContextDescription("private_messages"),
+    I18n.t("search.context.private_messages")
+  );
+  assert.equal(searchContextDescription("bad_type"), null);
+});