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Commit f6c4a986 authored by lumark's avatar lumark Committed by Ming-Shin Lu
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Prevent NPEs when no focusable stack. 

Fallback to home stack when no focusable stack
(e.g. launcher force stopped & enter PIP mode with no other app task),
Fix NPEs for logWindowState & getTopRunningActivity from null stack.

Change-Id: I0a0134661dfc20ff844a0bc19ce6833242f4a865
Fixes: 110078217
Test: Manual
Test: atest ActivityStackSupervisorTests ActivityStackTests ActivityStarterTests
parent 1a61e0ea
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