routing shorthand syntax works with multiple paths

Closes #9913.

We need to expand the match shorthand syntax for every path.

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -1369,11 +1369,6 @@ def match(path, *rest)
             paths = [path] + rest
           end
 
-          path_without_format = path.to_s.sub(/\(\.:format\)$/, '')
-          if using_match_shorthand?(path_without_format, options)
-            options[:to] ||= path_without_format.gsub(%r{^/}, "").sub(%r{/([^/]*)$}, '#\1')
-          end
-
           options[:anchor] = true unless options.key?(:anchor)
 
           if options[:on] && !VALID_ON_OPTIONS.include?(options[:on])
@@ -1383,6 +1378,12 @@ def match(path, *rest)
           paths.each do |_path|
             route_options = options.dup
             route_options[:path] ||= _path if _path.is_a?(String)
+
+            path_without_format = _path.to_s.sub(/\(\.:format\)$/, '')
+            if using_match_shorthand?(path_without_format, route_options)
+              route_options[:to] ||= path_without_format.gsub(%r{^/}, "").sub(%r{/([^/]*)$}, '#\1')
+            end
+
             decomposed_match(_path, route_options)
           end
           self

actionpack/test/dispatch/routing_test.rb

@@ -1149,6 +1149,20 @@ def test_match_shorthand_inside_namespace
     assert_equal 'account#shorthand', @response.body
   end
 
+  def test_match_shorthand_with_multiple_paths_inside_namespace
+    draw do
+      namespace :proposals do
+        put 'activate', 'inactivate'
+      end
+    end
+
+    put '/proposals/activate'
+    assert_equal 'proposals#activate', @response.body
+
+    put '/proposals/inactivate'
+    assert_equal 'proposals#inactivate', @response.body
+  end
+
   def test_match_shorthand_inside_namespace_with_controller
     draw do
       namespace :api do