Warn before navigating away

[domoritz]

Too often, we accidentally navigate back and lose the work. We should either make sure to not immediately save to local storage or show a warning.

[ydlamba]

I prefer showing a warning in all cases in which we actually might lose the work.

[domoritz]

Another option would be to save the undo history in local storage (at least some of it).

[ydlamba]

We can give a save button (or Ctrl+S shortcut) so that one can save whenever required and show a warning in cases like closing tab/navigating without saving, same as a normal editor does. It is the more intuitive.

[algomaster99]

@domoritz We currently lose the work only when we switch editors and that will probably solve after #12 is fixed.

[domoritz]

Well, in manual mode, you could also lose work, right? We could add a warning for that case.

[algomaster99]

@domoritz I switched to manual mode and did some changes. I refreshed the page and my changes were still there. Am I misunderstanding something?

[domoritz]

Did you run after making changes?

[algomaster99]

@domoritz No, I did not. The changes are preserved I guess.