Edit section = saves twice (duplicates)

It often happens that the xwiki saves twice the same content, leading to duplicates.

Discovered it after multiple saves on a big page. Had to merge the ... 8 versions it has saved ... not sure a standard user would appreciate that.

It happens often. Can't reproduce the exact steps. Here's the context :

• Edit is set to go in wiki mode by default
• Edit is done on a section
• Some switching between wysywg and text edit
• Slow connexion, lots of saves, some might be concurrent (slow connexion)
• Using a hotspot, on http (was it due to a service discovery attack ? if so, could be avoided by expiring save tokens or something like this). Seems to happen on the intranet too, so it's probably not an attack.