genlist : fix tree item floating issue when homoegeneous mode is enabled

genlist : fix tree item floating issue when homoegeneous mode is enabled

genlist item is flaoting upon the expanded item when homoegeneous mode
is enabled.
when item block is recalculated by tree expanding, new item didn't
update their properties and values becuase of size hash, but edc
actaully need to be recaculated after swallowing tree size padding.

solve the issue by adding expand depth check in size hash.

you can check the previous issue in T2708
elementary_test->genlist tree->homoegeneous check

@fix