[WIP] Save logic #4173

[stefan-kolb]

#4173
Save logic is fundamentally flawed imho 😢

Without a status bar, we have no more possibility to signal problems to the user (it is debatable if the status bar was the right place for errors anyway).
Or at least a lot of the problems are swallowed right now.

[tobiasdiez]

You can always use DialogService.showErrorMessage to notify the user about errors (i.e throw error in logic and catch it in the ui).

The fix looks good, but I'm asking myself we actually need a lock file in the first place...sounds so ancient to me.

[stefan-kolb]

The entire save logic looks wierd. I just scratched the surface.

[tobiasdiez]

I guess this is now surpassed by #4309.