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When editing pages I see that a lot of changes are made when I save an article. For example wiki attachments become visible after saving.
When I edit tags then it turns out that there often are many tags there, but were not visible before saving. (though many tags are mixed up between articles)
Is there a way to rebuild wiki articles?
If you mean that some rendered content on the page view is outdated and refreshes after saving, this could be due to the parsed-content cache. You can clear the whole thing by running AdminCP > Wiki > Maintenance > Rebuild Counters / Caches > Cache Parsed Content. A question would be to figure out what specific tags become stale, and if there is an obvious reason.
If you mean that there are a lot of tags that aren't visible WHILE EDITING, it may be that you are editing in XenForo's RTE mode, which shows the parsed version of the tag in the editor rather than the tag itself. This can occasionally have undesired effects, especially if the page already has broken or not-working tags. You may want to switch to the bb-code view occasionally (in XF1 this is the variety that is a naked textarea with no toolbar). Unfortunately that's not really anything to rebuild, as it's actually the raw code of the page.
Thanks!
With tags I mean the content tags that are editable below the wiki and can be used sitewide and found here: site.com/tags/
It would be great if XenForo provided a mass content-tag content-cache rebuilder, where you could choose what content type you wanted to rebuild tags for.
We can certainly add one for VaultWiki until such time that they create one. In the mean time though, editing and re-saving the content-tags is the only way I see to rebuild the cache from the perspective that tag-caches are out of sync without respect to which tags they have.
However, if it's just the same specific tags that are out of sync everywhere, you can go at it from that perspective: AdminCP > Content > Tags, by renaming the affected tags.
If you need to rebuild all content's tag-caches, not just specific tags, but you know that most content uses a certain 1 or 2 specific tags, you can use the specific tag option to backdoor a mass rebuild, by altering the shared tags as described in the last paragraph.