Skip handle pointer-down-outside-focus if input target changed

When TalkBack is enabled, the View#performClick is executed earlier
than the pointer-down-outside-focus event is handled. Therefore,
it is possible that the pointer-down-outside-focus is handled after
an Activity is already started, which unexpectedly changes the focus
again.

Bug: 381340445
Test: use Settings when Talkback is on
Flag: EXEMPT bugfix
Change-Id: Ib663e63b3c533b67f3d5a8cf51fe8cc5cb39f8e0