To save the recorded version of the file only when the file is closed, from unlock to lock in edit content model.

[laosierZhao]

In edit content mode, when we change a file and save it, we store a file record version, because this will save multiple records and occupy a lot of hard disk space.

However, we hope to be able to save the recorded version of the file only when the file is closed, from unlock to lock, like git saves the recorded version when only commit is made, and the intermediate modifications are not recorded.