Refine FocusHandlingTest

testMultiWindowFocusHandleOnDifferentUiThread originally expected that
onStartInput will be called when window focus changed.

since CL[1] reverts the behavior, so tests will need to refine:
1) Expect there is no onStartInput when focusing back to the window that
   already has served view.
2) Add SOFT_INPUT_STATE_HIDDEN for popup EditText to hide soft-keyboard
   when navigating forward the window.

[1]: If20cdb43ecd013c330c5e16c73e9af972bd89f33

Bug: 77152727
Bug: 152373385
Test: atest FocusHandlingTest
Change-Id: I50402165b150edc14e008225b8e40fdceb6edf91
2 files changed