It looks like attribute this could solve the issue:

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android:alwaysRetainTaskState

Whether or not the state of the task that the activity is in will
always be maintained by the system — "true" if it will be, and "false"
if the system is allowed to reset the task to its initial state in
certain situations. The default value is "false". This attribute is
meaningful only for the root activity of a task; it's ignored for all
other activities.
Normally, the system clears a task (removes all activities from the
stack above the root activity) in certain situations when the user re-
selects that task from the home screen. Typically, this is done if the
user hasn't visited the task for a certain amount of time, such as 30
minutes.
However, when this attribute is "true", users will always return to
the task in its last state, regardless of how they get there. This is
useful, for example, in an application like the web browser where
there is a lot of state (such as multiple open tabs) that users would
not like to lose.
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I will try it and post back the results.

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