[Request] Syncing stash AKA autosave

[camerondm9]

The current stash/unstash system is a lot like traditional save/open file management, and carries the same risk of data loss if you haven't saved recently (if we ignore the fact that Firefox can often recover previous sessions).
Would it be possible to implement something more like the autosave feature that many newer programs have?

What I'm picturing is something along these lines:

• If a window is given a name and autosave is enabled, then the window will automatically be saved to it's matching stash folder every time any tab is changed/opened/closed/navigated/etc.
• A small delay might be useful to avoid repeatedly saving if a tab redirects quickly. Not sure how important this would be.
• I feel like I'd probably just want autosave to be enabled for all windows, but a per-window setting could work too (might be nice to put a badge icon on the button then to indicate if it's enabled).
• For my purposes a one-directional sync from the opened window to the bookmark stash would be sufficient. Syncing in both directions sounds much more complicated.

You briefly mentioned something like this in a comment on #62 but I couldn't find any more details, so I figured I'd create an issue to indicate my interest in this specific feature.

[metafarion]

I like this idea. I'm coming from the Vivaldi browser in which you can have named Workspaces comprised of multiple tabs which are preserved when closed, and restorable without having been manually saved. Firefox doesn't really do this, but stashed windows could serve the same purpose if they were updated automatically.