Edit the task - Prevent 2 users open it at the same time

[marinhio75]

Hi Frédéric
my proposal:
We noticed that it's possible for two of us to edit a task at the same time.
If both write something, one saves it and the other then writes it, the content from the first one is overwritten.

It would be good to have a lock so that only one user can edit this task, and the other receives a message that opening it is currently not possible because another user is editing it.

Thank you for your tireless effort

Best regards
Mari