https://bugzilla.wikimedia.org/show_bug.cgi?id=67558

            Bug ID: 67558
           Summary: table editor: sort stable
           Product: MediaWiki
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: General/Unknown
          Assignee: [email protected]
          Reporter: [email protected]
       Web browser: ---
   Mobile Platform: ---

If you sort a table on column A then sort on column B, the result should be a
sort with B as major comparison and A as minor comparison.

Instead you get a sort with B as the major comparison, and A is ordered
randomly, because the sort algorithm used is unstable.

Do not use unstable sort for user interfaces, ever. Your favorite algorithm
might, /might/, be a tiny bit faster, but that feature is completely blotted
out by the importance of usability.

Click to sort ascending on column 1.
-> table resorted ordered by column 1
Click to sort ascending on column 2.
-> table resorted ordered by column 2
-> column 1 is no longer sorted

Example:
http://en.wikipedia.org/wiki/Comparison_of_HTML_editors

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