* core: allow to set disappearance interval when sending message
* remove commented code
* enable tests
* don't check content change on live item updates
* update logic
* rename variable
* refactor, restore that received message can disabled disappearing
* refactor
* Revert "refactor"
This reverts commit 60dee29d76.
* separate event
---------
Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>