https://bugzilla.wikimedia.org/show_bug.cgi?id=37685

       Web browser: ---
             Bug #: 37685
           Summary: detect edit conflicts on data items
           Product: MediaWiki extensions
           Version: master
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: WikidataRepo
        AssignedTo: [email protected]
        ReportedBy: [email protected]
                CC: [email protected]
    Classification: Unclassified
   Mobile Platform: ---


The item edit functionality has to implement detection of edit conflicts. Even
with atomic edits and an Ajax based UI, edit conflicts can still happen and
lead to inadvertedly overriding someone elses work:

1) A loads page X, with property foo=2 and bar=bla
2) B loads page X, with property foo=2 and bar=bla
3) A sets Foo from 2 to 3 and saves
4) B sets Foo from 2 to 4 and saves
5) B has unknowingly overwritten A's change.

Conflict resolution will be trivial with atomic edits, though: if A and B
change different properties, they do not actually generate a conflict.

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