Entering a closing html tag as a message stops chat logging for that contact until restart of Adium

For additional clarification, it is the "<(slash)html>" code specifically, entered without quotes, into a message, that kills logging.

Confirmed on 1.3svn [23090]

For clarification (although this might seem obvious) it only stops logging for that contact. Logging for other contacts continues as normal.

For those that are unaware, this could be pretty critical - setting to higher priority.

(In [23115]) We'll be running message through an HTML decoder. If we unescape all entities, we end up treating any typed HTML code as a real HTML code, because for example &lt;/html&gt; becomes </html> before the decoder even sees it. That's bad.

We apparently need to unescape ampersand immediately (I didn't retest that claim, made in #6850). We'll just do that rather than a full unescaping. Note that we can't use stringByUnescapingFromXMLWithEntities: with a dictionary specifying just the ampersand, the documentation for CFXMLCreateStringByUnescapingEntities(), which that method wraps, states "The standard XML entities are always replaced".

Fixes #9591

(In [23116]) Merged [23115]: We'll be running message through an HTML decoder. If we unescape all entities, we end up treating any typed HTML code as a real HTML code, because for example &lt;/html&gt; becomes </html> before the decoder even sees it. That's bad.

We apparently need to unescape ampersand immediately (I didn't retest that claim, made in #6850). We'll just do that rather than a full unescaping. Note that we can't use stringByUnescapingFromXMLWithEntities: with a dictionary specifying just the ampersand, the documentation for CFXMLCreateStringByUnescapingEntities(), which that method wraps, states "The standard XML entities are always replaced".

Fixes #9591