Last modified: 2013-09-06 09:07:04 UTC
The Wikitext warning is triggered in some circumstances without the user having entered Wikitext. The one cause I can reliably reproduce is where there is nowikied markup on the page from a previous edit. To reproduce: 1. Load https://en.wikipedia.org/w/index.php?title=User:Thryduulf/sandbox3&oldid=571089410&veaction=edit 2. Click anywhere on the last line of Section number two (the line that contains "[[Manhatan]]" and an ISBN, both of which are enclosed in nowiki tags). It seems that the warning is triggered by the existence of wikitext markup in the VE editing surface, rather than by its addition.
*** This bug has been marked as a duplicate of bug 51751 ***