https://bugzilla.wikimedia.org/show_bug.cgi?id=57489

       Web browser: ---
            Bug ID: 57489
           Summary: document.selection replaced by window.getSelection in
                    Internet Explorer 11 - breaks dialogs in WikiEditor
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: Unprioritized
         Component: WikiEditor
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected]
    Classification: Unclassified
   Mobile Platform: ---

document.selection is no longer supported in IE11, that breaks some browser
compatibility checks in WikiEditor and therefor the dialogs for links and
images.

document.selection.createRange is accessed without check of document.selection,
that gives a javascript error.

I am not sure, if it is enough to replace the msie check with a check for
document.selection && document.selection.createRange or to add a version to the
check.

See http://msdn.microsoft.com/en-us/library/ie/ms535869(v=vs.85).aspx

Thanks.

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