Fix / improve notification email subjects and bodies

todo/templates/todo/email/assigned_body.txt

@@ -1,6 +1,6 @@
 {{ task.assigned_to.first_name }} -
 
-A new task on the list {{ task.task_list.name }} has been assigned to you by {{ task.created_by.get_full_name }:
+A new task on the list {{ task.task_list.name }} has been assigned to you by {{ task.created_by.get_full_name }}:
 
 {{ task.title }}
 

todo/templates/todo/email/assigned_subject.txt

@@ -1 +1 @@
-GTD: New task - {% autoescape off %}Note: {{ task.title }}{% endautoescape %}
+A new task has been assigned to you - {% autoescape off %}{{ task.title }}{% endautoescape %}

todo/utils.py

@@ -21,11 +21,11 @@ def send_notify_mail(new_task):
             [new_task.assigned_to.email], fail_silently=False)
 
 
-def send_email_to_thread_participants(task, msg_body, user):
+def send_email_to_thread_participants(task, msg_body, user, subject=None):
     # Notify all previous commentors on a Task about a new comment.
 
     current_site = Site.objects.get_current()
-    email_subject = render_to_string("todo/email/assigned_subject.txt", {'task': task})
+    email_subject = subject if subject else render_to_string("todo/email/assigned_subject.txt", {'task': task})
     email_body = render_to_string(
         "todo/email/newcomment_body.txt",
         {'task': task, 'body': msg_body, 'site': current_site, 'user': user}

todo/views.py

@@ -200,7 +200,9 @@ def task_detail(request, task_id: int) -> HttpResponse:
             body=request.POST['comment-body'],
         )
 
-        send_email_to_thread_participants(task, request.POST['comment-body'], request.user)
+        send_email_to_thread_participants(
+            task, request.POST['comment-body'], request.user,
+            subject='New comment posted on task "{}"'.format(task.title))
         messages.success(request, "Comment posted. Notification email sent to thread participants.")
 
     # Save task edits