Fix hashtag extraction on post edit

activities/models/post.py

@@ -507,7 +507,7 @@ class Post(StatorModel):
     ):
         with transaction.atomic():
             # Strip all HTML and apply linebreaks filter
-            parser = FediverseHtmlParser(linebreaks_filter(content))
+            parser = FediverseHtmlParser(linebreaks_filter(content), find_hashtags=True)
             self.content = parser.html
             self.hashtags = sorted(parser.hashtags) or None
             self.summary = summary or None

tests/activities/models/test_post.py

@@ -42,6 +42,20 @@ def test_fetch_post(httpx_mock: HTTPXMock, config_system):
     assert Post.by_object_uri("https://example.com/test-post").id == post.id
 
 
+@pytest.mark.django_db
+def test_post_create_edit(identity: Identity, config_system):
+    """
+    Tests that creating/editing a post works, and extracts mentions and hashtags.
+    """
+    post = Post.create_local(author=identity, content="Hello #world I am @test")
+    assert post.hashtags == ["world"]
+    assert list(post.mentions.all()) == [identity]
+
+    post.edit_local(content="Now I like #hashtags")
+    assert post.hashtags == ["hashtags"]
+    assert list(post.mentions.all()) == []
+
+
 @pytest.mark.django_db
 def test_linkify_mentions_remote(
     identity, identity2, remote_identity, remote_identity2