Version 3.20

- ENH: Allow to override g:WriteBackup_DiffCreateAlwaysArguments and g:WriteBackup_DiffCreateDefaultArguments with buffer-local variables; e.g. to provide a filetype-specific "--show-function-list" diff argument.
- ENH: When the current window is in diff mode, "inherit" the participation in the diff to the next backup file on :WriteBackupGo* commands, as the user probably wants to continue comparing them.
- BUG: On Windows, when file backups exist in different upper-/lowercase versions, the ordering of :WriteBackupListVersions and :WriteBackupGoPrev/Next are broken.
Version 3.21

- Implement abort on error for all commands.
- CHG: writebackupVersionControl#ListVersions() now indicates no backups exist with 2 instead of 0.
- CHG: writebackupVersionControl#RestoreThisBackup(), writebackupVersionControl#RestoreFromPred(), writebackupVersionControl#DeleteBackupLastBackup() now indicate user decline with 2 instead of 0.
- Keep the same 'fileformat' as the original buffer's on :WriteBackupViewDiffWithPred. This matters when the diff is persisted as a patch.
- Add dependency to ingo-library (vimscript #4433). *** You need to separately install ingo-library (vimscript #4433) version 1.013 (or higher)! ***