onWillRenameFiles
An event that is emitted when files are being renamed.
Note 1: This event is triggered by user gestures, like renaming a file from the explorer, and from the {@linkcode workspace.applyEdit}-api, but this event is not fired when files change on disk, e.g triggered by another application, or when using the {@linkcode FileSystem workspace.fs}-api.
Note 2: When renaming a folder with children only one event is fired.