Data loss on double screen rotation

[davirec]

Hi, this issue has a relation with #71.

We found failures similar in the MainActivity:

Before and after double screen rotation

Before and after double screen rotation

Before and after double screen rotation

Note:

• Double screen rotation: It is executed twice to reach a state that should be exactly the same as the screen before if no data loss occurred.
• A data loss problem occurs when data is accidentally deleted or state variables are accidentally assigned with default or initial values.