am a6309c30: On BACK in search, hide just IME if IME is fullscreen

Merge commit 'a6309c30722ad3aee88ddc2394cea2a499168d99' into eclair-plus-aosp

* commit 'a6309c30722ad3aee88ddc2394cea2a499168d99':
  On BACK in search, hide just IME if IME is fullscreen