Redmine Dashboards

News thumbnails should be rendered via:

<%= image_tag(
thumbnail_path(attachment),
:srcset => "#{thumbnail_path(attachment, :size => thumbnail_size * 2)} 2x",
:style => "max-width: #{thumbnail_size}px; max-height: #{thumbnail_size}px;"
) %>

By doing so, the image will integrated in a small default size (as configured in administration area) improving the performance of the page when loading.