commit 4577bc23f04855da8f7c38aab121e0f9b8248353
author Tyler Gunn <tgunn@google.com> Tue Apr 06 11:38:19 2021 -0700
committer Tyler Gunn <tgunn@google.com> Tue Apr 06 11:51:06 2021 -0700
tree 1bdf4bcf71dd2fb5f8ee35c632ba382dfd6bd548
parent 7b8d0a897808dae27db1fc7b163f971e279cc8fa

Add EXTRA_ANSWERING_DROPS_FG_CALL to incoming call in some DSDS cases.

When a waiting call comes in and there is an in-progress call on another
subscription, answering the incoming call will cause the ongoing call
to drop.

Detect this scenario and add EXTRA_ANSWERING_DROPS_FG_CALL to the waiting
call so that Dialer will notify the user of this scenario.

Bug: 178649879
Test: Added over complicated unit tests to verify extra adding behavior.
Change-Id: Id4caf8c210151bc0125b09a87e3c1dede2117649