| Class | Description | 
|---|---|
| CheckFileStatus | Migration step for the 'checkFileStatus' property whose meaning changed slightly
    in jEdit. | 
| KeymapMigration | Extracts, removes the shortcuts from jEdit 4.5 properties, and places them into the "imported" keymap. | 
| OneTimeMigrationService | Base class from which one can more easily implement a migration step
    that should be executed only once per installation. |