Prevent accidental closing of page

[Quasimondo]

It would be really helpful if there was a window.onbeforeunload handler added in order to prevent accidental closing of the current job. Also it would be really nice if the tool remembered the last state, including placed objects and laser settings.

It happened several times now to me that during a job that required some precision placement of subsequent jobs I accidentally clicked the "navigate back" button on my mouse which resets the enire workspace and requires me to start from scratch.

[Quasimondo]

I just noticed that previous placements are already stored in the design library, so that's good.