This filter determines which tiddlers will be saved to local storage.
* `[prefix[$:/state/]] -[prefix[$:/state/popup/]]` - the default value. Save state tiddlers except popup state tiddlers, thus preserving selected tabs and the open/closed status of table of contents entries. Any other tiddlers created or changed will be lost after reloading the page.
* `[all[]]` - attempt to save all changed tiddlers. This means even popup state tiddlers and temporary tiddlers will be saved.
* `[all[]] -[prefix[$:/state/popup/]] -[prefix[$:/temp/]] -[prefix[$:/HistoryList]]` - save all tiddlers except popup state tiddlers, temp tiddlers and the history list.