abc2180090
Symptom: 1. Acitivity A and B belong to same task. 2. A is started and start B in its code 3. B is opened with blank screen If starting icon has been display, both startingWindow and startingView should not be null. Current logic only uses judgement on startWindow. In above case, it leads startingView set to null as A and B shares the same starting window due to same task. Then system will not get chance to remove startingView as it is null. It needs add judgement on startingView. Based on https://android-review.googlesource.com/#/c/194370/ Change-Id: I6cfa1a3ebce93ce435cc2d9ada239b1e808988de