How to retrieve the snapshot for file system of a certain time?

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I'm developing a plugin now, and need to get the difference between old version file system and the new one.

It is written in the SDK document that VTS supports tracking file modifications and providing both old and new versions of the file content when a change is detected. I cannot find the method to retrieve the snapshot for file system of a certain time.

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You can retrieve the "current change" diff as described here https://plugins.jetbrains.com/docs/intellij/virtual-file-system.html#virtual-file-system-events. What do you mean with "of a certain time" exactly? There is no thing such as a full history in VFS.

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