Android task/stack: why new task created in this case? -

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i'm trying clear task/back stack on android @ http://developer.android.com/design/patterns/navigation.html.

when reach part below have question. please take on first (or go link above read post)

however, touching compose activity, user indicates desire remain within gmail. gmail's conversation list activity appears, , new task b created it. new tasks rooted home, touching conversation list returns there.

enter image description here

task persists in background, , user may return later (for example, via recents screen). if gmail had own task running in background, replaced task b—the prior context abandoned in favor of user's new goal.

now, question.

  • why create new task b in case? (when user touching compose activity)
  • what means "it replaced task b"

could make clear, please!?

check link, that's because recent task have change in lollipop


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