Last modified: 2014-06-06 17:53:09 UTC
When using TemplateSandbox's preview button, the pre-save transform is applied to the page being previewed, rather than the template used in the preview. If subst, the pipe trick, etc. are used in a template, this results in TemplateSandbox's output being wrong. Also, if the page being previewed contains recursively converting wikitext like at https://meta.wikimedia.org/wiki/Help:Recursive_conversion_of_wikitext , it will be shown as transforming (which is incorrect since that page won't be saved).
Change 137343 had a related patch set uploaded by Anomie: Apply PST to the correct page https://gerrit.wikimedia.org/r/137343
Change 137343 merged by jenkins-bot: Apply PST to the correct page https://gerrit.wikimedia.org/r/137343