Split off from bug 12056. Input such as
is converted to something like:
where <del> is the delete character, 0x7f. Typcially this occurs in the pre-save transform, so the result is saved into articles, leading to diffs such as these:
All XML-style tag extensions are affected.
On some installations this happens all the time, on others it happens randomly and is not reproducible. It has been reported on:
- Roan Kattouw's Windows test server. Reproducible with PHP 5.2.4 cgi/fcgi, not observed in the same installation under the CLI SAPI.
- Unknown servers in Wikimedia's app cluster. Is it server dependent or random?
- Reproducibly on Bertrand Grondin's server at grondin.tuxfamily.org
- Randomly on translatewiki.net, reported by Nikerabbit
During an attempt to narrow down the problem on Roan Kattouw's server, an odd bug was observed where a Title object would disappear, triggering a fatal "cannot call member function of non-object". This may or may not be related.