Saved calculations are lost when the app is closed

Calculations seem to be saved to disk on exit, but the Ubuntu Touch shell simply kills the process.

You can re-create this on the desktop by running the app from the command line, and killing it from the command line, instead of closing the window.

The solution would be to save to disk whenever = is pressed at a minimum, or even after every chance to the current calculation

That's just wrong. While save operation is not very expensive it might be noticeable. If we look into the future it is not unusual to save app state on app exit as there might be more information to save (not calculator app, but overall). Ubuntu Touch should handle this properly.

Presumably the shell just sends the KILL signal, couldn't the SDK catch the signal and tell the app to exit normally at this point?

Question. How to reassign this problem to SDK team? That's just wrong that you can't perform some operation on exit. Android can do that, iOS can do that, Symbian can do that, BB10 can do that, Ubuntu Phone wants to be unique snowflake?

Some more context from the IRC conversation this morning:

<dpm> morning Saviq. We've got a bug in the calculator app that is caused by the shell killing the process on exit without notification. I'm not sure what the best project to add a bug task for might be. Do you have any suggestions? It's bug 1188292
<Saviq> dpm, it's something the app lifecycle will handle - apps will be given some grace period to save their data / serialize their state
 dpm, after that they're stopped and the process is not guaranteed to be started again
<dpm> Saviq, gotcha. Do you know where the bugs for app lifecycle are tracked? Is it platform-api?
<Saviq> dpm, I don't think there's any place yet, as the whole thing isn't built yet
<greyback> dpm: please log in "qtubuntu" package for now

I tried sending SIGUP SIGTERM and SIGKILL, and the app isn't able to close gracefully. Sending the XEvent for close, as noted, does work.

In the short term, let's save on every tear-off event just to make sure those are being saved

Fix committed into lp:ubuntu-calculator-app at revision None, scheduled for release in ubuntu-calculator-app, milestone alpha-1