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-[[template id=plugin name=showdiff author="[[JeremieKoenig]]"]]
-[[tag type/useful]]
-
-This plugin, which can be downloaded
-[here](http://www.jk.fr.eu.org/ikiwiki/showdiff.pm),
-adds a "Show Diff" button to the page edition template.
-When clicked, a diff between the stored page and provided content
-is shown in the "Page Preview" area.
-
-It depends on
-[this patch](http://www.jk.fr.eu.org/ikiwiki/pluggable_editpage_buttons.diff),
-which does the following:
-
- * add a title to the editpage form;
- * pass a reference to the list of buttons to the formbuilder_setup
- hooks, so we can add ours;
- * relax asumption about the possible submit values (use "Save Page"
- explicitly);
- * de-hardcode the submit buttons from the editpage template
- (was this intended to work around something?).
-
-> That was there to work around a bug in CGI::FormBuilder 3.0401
-> that broke FORM-SUBMIT on customised templates. That seems to be
-> fixed in the newer version ikiwiki already depends on. Patch accepted.
-> --[[Joey]]
-
-## Problems
-
-No special handling is done of concurrent edits: changes introduced
-independently will show up in the requested diff, although they will
-be merged when the page is saved. I suspect even detecting this case
-would require changes in the RCS backends.