<p></p>
<p><b>@milan-cvetkovic</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/4329#discussion_r1393980950">app/controllers/users_controller.rb</a>:</p>
<pre style='color:#555'>> @@ -317,6 +305,24 @@ def auth_failure
 
   private
 
+  def welcome_options
+    uri = URI(session[:referer]) if session[:referer].present?
+    welcome_options = {}
+    welcome_options["oauth_return_url"] = session[:referer] if uri&.path == oauth_authorization_path
+
+    begin
+      %r{map=(.*)/(.*)/(.*)}.match(uri.fragment) do |m|
+        editor = Rack::Utils.parse_query(uri.query).slice("editor")
+        welcome_options = { "zoom" => m[1],
+                            "lat" => m[2],
+                            "lon" => m[3] }.merge(editor).merge(welcome_options)
</pre>
<p dir="auto">I am not too sure about this.</p>
<p dir="auto">What is the use case that would have a fragment in <code class="notranslate">session[:referrer]</code>?</p>
<p dir="auto">I wasn't able to reproduce it...</p>

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