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Parallel edits of the wiki

Hi,

When two people edit a wiki page at the same time, using the web interface, they may loose their last edits.

Here is a simple scenario to reproduce:

  • User A opens a wiki page for edition.
  • User B opens the same wiki page for edition.
  • Users A and B edit the wiki page.
  • User A saves the wiki page.
  • User B saves the wiki page.

Changes made by user A will be lost, as both "save" actions create a commit from the same old commit and move the HEAD, as far as I understood. Without using some git magic, the changes made by user A are definitely lost.

A big warning message when user B saves stating that "the local wiki page has been modified during your edit, are you really sure you want to overwrite it" would be cool :)