Fix N+1 query problem for snippets dashboard.

Closes #40755.

app/finders/snippets_finder.rb

@@ -28,7 +28,7 @@ class SnippetsFinder < UnionFinder
     segments << items.public_to_user(current_user)
     segments << authorized_to_user(items)  if current_user
-    find_union(segments, Snippet)
+    find_union(segments, Snippet.includes(:author))
   end
   def authorized_to_user(items)

app/views/shared/snippets/_snippet.html.haml

 - link_project = local_assigns.fetch(:link_project, false)
 %li.snippet-row
-  = image_tag avatar_icon(snippet.author_email), class: "avatar s40 hidden-xs", alt: ''
+  = image_tag avatar_icon(snippet.author), class: "avatar s40 hidden-xs", alt: ''
   .title
     = link_to reliable_snippet_path(snippet) do

changelogs/unreleased/40755-snippets-author-n-1.yml

+---
+title: Fix N+1 query problem for snippets dashboard.
+merge_request: 16944
+author:
+type: performance