Fix hashtags not being picked up when full-width hash sign is used (#36103)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

spec/lib/extractor_spec.rb

@@ -35,12 +35,24 @@ RSpec.describe Extractor do
   end
 
   describe 'extract_hashtags_with_indices' do
-    it 'returns an empty array if it does not have #' do
+    it 'returns an empty array if it does not have # or ＃' do
       text = 'a string without hash sign'
       extracted = described_class.extract_hashtags_with_indices(text)
       expect(extracted).to eq []
     end
 
+    it 'returns hashtags preceded by an ASCII hash' do
+      text = 'hello #world'
+      extracted = described_class.extract_hashtags_with_indices(text)
+      expect(extracted).to eq [{ hashtag: 'world', indices: [6, 12] }]
+    end
+
+    it 'returns hashtags preceded by a full-width hash' do
+      text = 'hello ＃world'
+      extracted = described_class.extract_hashtags_with_indices(text)
+      expect(extracted).to eq [{ hashtag: 'world', indices: [6, 12] }]
+    end
+
     it 'does not exclude normal hash text before ://' do
       text = '#hashtag://'
       extracted = described_class.extract_hashtags_with_indices(text)

spec/models/tag_spec.rb

@@ -84,6 +84,10 @@ RSpec.describe Tag do
       expect(subject.match('this is #ａｅｓｔｈｅｔｉｃ').to_s).to eq '#ａｅｓｔｈｅｔｉｃ'
     end
 
+    it 'matches ＃ｆｏｏ' do
+      expect(subject.match('this is ＃ｆｏｏ').to_s).to eq '＃ｆｏｏ'
+    end
+
     it 'matches digits at the start' do
       expect(subject.match('hello #3d').to_s).to eq '#3d'
     end