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