Last modified: 2014-10-27 01:41:58 UTC
It seems like nowiki-tags shows up at edits done at nowiki with VisualEditor. The first of the two examples (https://no.wikipedia.org/w/index.php?title=Cologne_Business_School&diff=13473599&oldid=13473538) could be a copy-paste. If so it is an user error and the same as in Bug 68928 VisualEditor: Copy/pasting causes <nowiki> and <em> tags to appear. The second edit seems to be different (https://no.wikipedia.org/w/index.php?title=Bergen&diff=prev&oldid=13467156) and I'm not sure what has happen here. Perhaps it is Bug 49820 - VisualEditor: When user types in '[[' in the page or another DOM input widget, pop up a reminder that they're using VisualEditor. If this is the case the user has clicked through a warning (has it failed?) and still saved. There is a thread at nowiki about this, https://no.wikipedia.org/wiki/Wikipedia:Torget#Tomme_nowiki-tagger ("Empty nowiki-tags")
Allow me to underline the irony of a nowiki at no.wiki :D I don't think the first case is related to that bug - that simply looks like wikicode copy/pasted in a VE instance, that's why the nowiki tags are generated. The second case looks more like a confused attempt to edit a wikilink, similar to [[bug 70286]]. As for wikitext warnings, those do exist, but I don't know if they're currently working (I filed a bug about that today) or if they're supposed to work when you copy/paste (not type) wikicode. I'd argue this should be possibile, since this is not the first time we see copy/pasting confusion.
This should perhaps be a feature request as it seems to be about additional warning messages.