some item widget require specific animation of deletion process.
previously del_pre_hook callback can handle this process by return type,
but after changing del_pre_hook return type, item cannot intercept
deletion process for adding animation.

here my suggestion for delete animation is,
set efl_del_intercept in animation required case,
to avoid edje view object elimination.

each item widget has to call view_clear function after all animation processed.

tested with few genlist deletion process changes(adding 1 sec timer of deletion).
clear case can occur the infinite loop,
so carefully control the intercept on deletion.

to test this,
please apply upon elm_genlist.c file.