to work-around android bug #224270.
This is only necessary if the transitioning view might not be available
anymore when the exit transition is made.

All changes to the adapter are cumulative.

Also fixed a couple of bugs.

This way the forum and private group client do not need to keep track of
message timestamps themselves and do not need to interact with
post/message factories.

Also made some listeners volatile.

and maintain keyboard state when hiding view.