... of mWindowAttributes. Apps might update LayoutParams with
softInputMode unspecified on applying insets, and this can cause
infinite loop in the previous logic, because we would auto-compute
softInputMode for the unspecified one, which makes app's softInputMode
never be the same as the one in ViewRootImpl.mWindowAttributes.
Fix: 163009478
Test: Print stack trace before calling requestFitSystemWindows() and
follow the steps in the bug.
Test: Open Messages, go to attachments, reopen IME
Change-Id: I2341121b69209688c2f6fb033f51611b21422a04
e80e94182c