Drawer loading failsafe

There's been an issue with drawer showing up blank after
either a transition or after one load of the inbox.

The change introduces resetAndLoadDrawer to manage the
folder list fragment being replaced only when the drawer
is completely closed (So there's no item addition while
the drawer is moving, which caused some jank/lag issues).

The fix should take care of the blank drawer issue in the
normal labels. Search view modes may still give issues, but
that'll be fixed when lock/disable drawer functionality is
added.

Change-Id: Idc3ab6e2ede17fd404ae88fbeaa3b904ab19a740
1 file changed