[Mediawiki-l] Concurrency in editions

[Juan Jesús Cremades Monserrat]

Hi,

I must resolve the next problem:

If one user is editing one page, I do not want that a second user enters to
the editor and save another modifications because the first changes stored
will be showed like an old versions and do not appear.


I has been looking for an addon to block the editor in a page that it has
being edited, but I hasn't found. Exists really? Thanks