* Frank Terbeck wrote [21.09.10 09:28]:
Hi,
> When does vim store this information? If it's just upon `:quit', I
> don't think there's any reason not to do this (although vim's
> undo-trees can become rather big).

After writing a file:
,----[he persistent-undo]
| The 'undofile' option is checked after writing a file, before the BufWritePost       
| autocommands.  If you want to control what files to write undo information           
| for, you can use a BufWritePre autocommand: >                                        
`----


Ulrich