https://bugzilla.wikimedia.org/show_bug.cgi?id=31102

       Web browser: ---
             Bug #: 31102
           Summary: buildTool function uses improper for loop for filters
           Product: MediaWiki extensions
           Version: any
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: WikiEditor
        AssignedTo: wikibugs-l@lists.wikimedia.org
        ReportedBy: wilson.ji...@gmail.com
                CC: roan.katt...@gmail.com, tpars...@wikimedia.org
    Classification: Unclassified


This problem affects wikiEditor for MW 1.17 - I have not tried other versions.

In jQuery.wikiEditor.toolbar.js, the buildTool function improperly uses a
for..in loop to iterate through an array (specifically, for applying filters). 
This works fine as long as nobody has added to the Array.prototype, but if they
have the for..in loop will pick up non-integer keys.

Although some JavaScript libraries shy away from making changes to prototypes,
there are plenty of legacy ones which still do.  

This bug causes blocking JavaScript errors whenever an addition to
Array.prototype has a value which causes jQuery to return a wrapped array
instead of an actual jQuery collection.

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