This problem is dependent on solving bug 31499, otherwise you can't see the behavior.
1. In the insert-link dialog of WikiEditor, enter a http link to a wiki page, plus a query string. For example, if your wiki is mywiki.com, enter:
http://mywiki.com/wiki/MyPage?action=purge
The editor warns you:
The URL you specified looks like it was intended as a link to another wiki page. Do you want to make it an internal link?
You click "Internal Link", and the link changes to:
MyPage?action=purge
which then inserts (wrongly):
[[MyPage?action=purge]]
Ideally it should get turned into:
[{{fullurl:MyPage|action=purge}} link text]
WikiEditor fails similarly if you enter the "index.php?title=" form of the title:
http://mywiki.com/w/index.php?title=MyPage
This does not get recognized as an internal link to the local wiki. Ideally it would get turned into:
[[MyPage]]
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**Version**: unspecified
**Severity**: normal