Back button loses everything #25
Description
Some feedback from some recent user training:
- Currently if the user accidentally presses the back button they loses all work that they've been doing.
- This is a harsh response for accidental use of common functionality.
- Ideally we'd show an "Are you sure?" dialogue for this, see https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event
See also: transpower-nz/open-scd#37