FEATURE: Drafts view in user profile

* add drafts.json endpoint, user profile tab with drafts stream

* improve drafts stream display in user profile

* truncate excerpts in drafts list, better handling for resume draft action

* improve draft stream SQL query, add rspec tests

* if composer is open, quietly close it when user opens another draft from drafts stream; load PM draft only when user is in /u/username/messages (instead of /u/username)

* cleanup

* linting fixes

* apply prettier styling to modified files

* add client tests for drafts, includes a fixture for drafts.json

* improvements to code following review

* refresh drafts route when user deletes a draft open in the composer while being in the drafts route; minor prettier scss fix

* added more spec tests, deleted an acceptance test for removing drafts that was too finicky, formatting and code style fixes, added appEvent for draft:destroyed

* prettier, eslint fixes

* use "username_lower" from users table, added error handling for rejected promises

* adds guardian spec for can_see_drafts, adds improvements following code review

* move DraftsController spec to its own file

* fix failing drafts qunit test, use getOwner instead of deprecated this.container

* limit test fixture for draft.json testing to new_topic request only

app/models/draft.rb

@@ -43,6 +43,43 @@ class Draft < ActiveRecord::Base
     end
   end
 
+  def self.stream(opts = nil)
+    opts ||= {}
+
+    user_id = opts[:user].id
+    offset = (opts[:offset] || 0).to_i
+    limit = (opts[:limit] || 30).to_i
+
+    # JOIN of topics table based on manipulating draft_key seems imperfect
+    builder = DB.build <<~SQL
+      SELECT
+        d.*, t.title, t.id topic_id, t.archetype,
+        t.category_id, t.closed topic_closed, t.archived topic_archived,
+        pu.username, pu.name, pu.id user_id, pu.uploaded_avatar_id, pu.username_lower,
+        du.username draft_username, NULL as raw, NULL as cooked, NULL as post_number
+      FROM drafts d
+      LEFT JOIN topics t ON
+        CASE
+            WHEN d.draft_key LIKE '%' || '#{EXISTING_TOPIC}' || '%'
+              THEN CAST(replace(d.draft_key, '#{EXISTING_TOPIC}', '') AS INT)
+            ELSE 0
+        END = t.id
+      JOIN users pu on pu.id = COALESCE(t.user_id, d.user_id)
+      JOIN users du on du.id = #{user_id}
+      /*where*/
+      /*order_by*/
+      /*offset*/
+      /*limit*/
+    SQL
+
+    builder
+      .where('d.user_id = :user_id', user_id: user_id.to_i)
+      .order_by('d.updated_at desc')
+      .offset(offset)
+      .limit(limit)
+      .query
+  end
+
   def self.cleanup!
     DB.exec("DELETE FROM drafts where sequence < (
                SELECT max(s.sequence) from draft_sequences s