Allow joining several hashtags in a single column (#8904)

* Nascent tag menu on frontend

* Hook up frontend to search

* Tag intersection backend first pass

* Update yarnlock

* WIP

* Fix for tags not searching correctly

* Make radio buttons function

* Simplify radio buttons with modeOption

* Better naming

* Rearrange options

* Add all/any/none functionality on backend

* Small PR cleanup

* Move to service from scope

* Small cleanup, add proper service tests

* Don't use send with user input :D

* Set appropriate column header

* Handle auto updating timeline

* Fix up toggle function

* Use tag value correctly

* A bit more correct to use 'self' rather than 'all' in status scope

* Fix some style issues

* Fix more code style issues

* Style select dropdown more better

* Only use to_id'ed value to ensure no SQL injection

* Revamp frontend to allow for multiple selects

* Update backend / col header to account for more flexible tagging

* Update brakeman ignore

* Codeclimate suggestions

* Fix presenter tag_url

* Implement initial PR feedback

* Handle additional tag streaming

* CodeClimate tweak

spec/services/hashtag_query_service_spec.rb

@@ -0,0 +1,60 @@
+require 'rails_helper'
+
+describe HashtagQueryService, type: :service do
+  describe '.call' do
+    let(:account) { Fabricate(:account) }
+    let(:tag1) { Fabricate(:tag) }
+    let(:tag2) { Fabricate(:tag) }
+    let!(:status1) { Fabricate(:status, tags: [tag1]) }
+    let!(:status2) { Fabricate(:status, tags: [tag2]) }
+    let!(:both) { Fabricate(:status, tags: [tag1, tag2]) }
+
+    it 'can add tags in "any" mode' do
+      results = subject.call(tag1, { any: [tag2.name] })
+      expect(results).to include status1
+      expect(results).to include status2
+      expect(results).to include both
+    end
+
+    it 'can remove tags in "all" mode' do
+      results = subject.call(tag1, { all: [tag2.name] })
+      expect(results).to_not include status1
+      expect(results).to_not include status2
+      expect(results).to     include both
+    end
+
+    it 'can remove tags in "none" mode' do
+      results = subject.call(tag1, { none: [tag2.name] })
+      expect(results).to     include status1
+      expect(results).to_not include status2
+      expect(results).to_not include both
+    end
+
+    it 'ignores an invalid mode' do
+      results = subject.call(tag1, { wark: [tag2.name] })
+      expect(results).to     include status1
+      expect(results).to_not include status2
+      expect(results).to     include both
+    end
+
+    it 'handles being passed non existant tag names' do
+      results = subject.call(tag1, { any: ['wark'] })
+      expect(results).to     include status1
+      expect(results).to_not include status2
+      expect(results).to     include both
+    end
+
+    it 'can restrict to an account' do
+      BlockService.new.call(account, status1.account)
+      results = subject.call(tag1, { none: [tag2.name] }, account)
+      expect(results).to_not include status1
+    end
+
+    it 'can restrict to local' do
+      status1.account.update(domain: 'example.com')
+      status1.update(local: false, uri: 'example.com/toot')
+      results = subject.call(tag1, { any: [tag2.name] }, nil, true)
+      expect(results).to_not include status1
+    end
+  end
+end