Request: Add button to change fragment list presentation mode.

[Nstd]

Current fragment presentation mode is All Fragments and subFragments. But it's a little confused to find the visibile one. So, hope there's a button to change the presentation mode which can only show the visibile fragment list.

eg:

  subA2       subB2
  subA1       subB1      subC1
fragmentA   fragmentB  fragmentC
                 ↑
          Current Visible


hope there's a mode to show as follow:

fragmentB
  subB1
  subB2