Feature request: Lock file

Hi
Since we started to have multiple users opening the same project, we are continuously running into problems saving the changes one made.
How about the option that once a project is opened from a user, a lock file is placed next to the project file. This is a common solution by many applications. I would much rather have a true and locked single user solution than end up in continuously merging files created to save users changes.

The cloud seems not to solve this problem either since there still is no merge option and the lock has to be done manually. That said, we would have the very same situation even if we use cloud service or local webDAV.

McL