Currently written toot can get lost when minimized

[hasselmm]

Detailed description

When writing a toot it is risky to switch to another app to copy for instance a link: If Android decides to suspend Tusky while in background your currently written toot gets lost. Tusky should persist the currently written toot from within Activity.onStop() to prevent this issue from happening.

Steps to reproduce the problem

1. Start a memory intense app, like your browser with dozen of open tabs
2. Switch to Tusky and start writing a toot
3. Switch to the memory hog
4. Return to Tusky

With some chance Tusky got killed and restarted to allow the memory intense app working.

Debug information

It's a general issue present on any device.

[connyduck]

Sorry for that, we will release the fix soon
#4685