[Bug 19062] New: Escaped HTML-entities do not round-trip when using forms

[bugzilla-daemon]

https://bugzilla.wikimedia.org/show_bug.cgi?id=19062

           Summary: Escaped HTML-entities do not round-trip when using forms
           Product: MediaWiki extensions
           Version: any
          Platform: All
               URL: http://km.aifb.uni-
                    karlsruhe.de/projects/owltests/index.php?title=Consisten
                    t-but-all-unsat&oldid=3329
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: SemanticForms
        AssignedTo: yaro...@gmail.com
        ReportedBy: mar...@semantic-mediawiki.org
                CC: wikibugs-l@lists.wikimedia.org


The above example URL shows a wiki where XML-documents are managed using
templates and forms. XML uses many characters that also have special meaning in
MediaWiki, but most of those do not need any escaping, since they do not occur
in contexts that MW recognizes. There are two exceptions:

* Comments in XML are written as in MediaWiki. To prevent MW from interpreting
them, it is necessary to write "&lt;!--" on the wiki page instead of "<!--".

* XML entities are unescaped by MediaWiki during parsing. So to get an escaped
entity like "&lt;" into a semantic property value, one needs to write
"&amp;lt;" in the input.

Both encodings work in MW and SMW. (A more general but less user-friendly
strategy would be to escape all <, >, ", ... in the input fields. This would be
more systematic, but most cases work pretty well without such escapes.)

Now the problem is that, when editing with SRF, the text that is loaded into
the form does not contain the original entities, i.e. it shows "<!--" where the
page included "&lt;!--" and it shows "&lt;" where the page included "&amp;lt;".
Either SF does too much unescaping, or it simply passes on literal escaped text
to the browser who unescapes it for display. In any case, "edit with form"
changes the page contents even if the user does not modify the form contents at
all.

Tested on FF 3.0.10, MW 1.14alpha,  SMW 1.5e-SVN, SF 1.6.


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