[android-developers] Android 4.0 issue with Activity Stack and Task Stack

I am developing an app for android 4.0. I am confuse with Task and
Activity stack for Android 4.0.

suppose I have activities X,Y,Z of the same app. so when i fire Home
intent with flag activity_clear_task i am navigated to home which is
expected.

case I when I am in some other app's activity say setting-> manage
application and if Home intent is fired from my activity i am able to
navigate to home but when i click on menu i don't see any thing thing
is the new task is started ?

case II when i fired home intent while i am in my aap then i am
navigated to home and i am able to see the menu.which is expected.

case III follow the procedure as case I and relaunch the app using to
app using long key pressed and again home intent is fired i am
navigated back to home and now i can see the menus when clicked on
menu

my question here is why this is happening ? it works perfectly well on
2.3 and lower. is it because of new implementation of task and
activity stack? i am confused.

also i faced activity stack issue about the activity stack behavior in
4.0 as when i launch setting->manage application come back to home and
launch contact app and go to its sub-activities and press home button
and navigate back to setting now press back key until u exit setting
and u'l see something strange as u are navigated to home not the
contact app.

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