Displays thumbnails of attached images of the issue view (#1006).

This behaviour can be turned on/off in Settings -> Display (off by default). Thumbnail size can be configured there too.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9933 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/integration/routing/attachments_test.rb

@@ -45,6 +45,10 @@ class RoutingAttachmentsTest < ActionController::IntegrationTest
            { :controller => 'attachments', :action => 'download', :id => '1',
              :filename => 'filename.ext' }
          )
+    assert_routing(
+           { :method => 'get', :path => "/attachments/thumbnail/1" },
+           { :controller => 'attachments', :action => 'thumbnail', :id => '1' }
+         )
     assert_routing(
            { :method => 'delete', :path => "/attachments/1" },
            { :controller => 'attachments', :action => 'destroy', :id => '1' }