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Fix primary activity untouchable with punch hole
The root cause is that the letterbox receives touches within the whole task, which made the primary activity untouchable. This CL changes to make the letterbox only cover the secondary taskfragment area Test: manual - repro steps in bug Bug: 271592105 Change-Id: I2d724736d01a8fc50fe4c82c8b8cca2769d97d4f