https://bugzilla.wikimedia.org/show_bug.cgi?id=62454

            Bug ID: 62454
           Summary: $.byteLimit gets confused when pasting text at the
                    beginning of the input field that has a common prefix
                    with the current text
           Product: MediaWiki
           Version: 1.23-git
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: JavaScript
          Assignee: wikibugs-l@lists.wikimedia.org
          Reporter: matma....@gmail.com
                CC: krinklem...@gmail.com, matma....@gmail.com,
                    tpars...@wikimedia.org
       Web browser: ---
   Mobile Platform: ---

If you paste text at the beginning of the input field that has a common prefix
with the current text (or, simply, is identical), $.byteLimit gets confused
about which part was there already and which is new. It doesn't seem possible
to work around this without a larger rewrite, as we do not track this
information. :/

Simplified test case:
* Have input with with bytelimit=12:
  $('#mw-content-text').replaceWith( $('<input>').byteLimit(12) )
* Have text in it "ążśó" (8 bytes, 4 characters)
* Paste "ążśó" at the beginning
* Expected result: "ążążśó", actual result: "ążśóąż"

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