Typed Unsent Message Deletes If Another User Posts Before Sending

[acshields]

Bug Description: If a user posts a message as another user is writing a message in a discussion thread, the message that the user is writing is deleted as the discussion thread refreshes.

Solution: The unsent typed message should be saved as a draft while the discussion thread refreshes.

[maxceem]

@RishiRajSahu done via #4124

[lakshmiathreya]

Unable to verify this since Message notifications are failing:

[maxceem]

@lakshmiathreya could you please try one more time with another project, maybe there is some corrupted data in that project. The error you've got is not connected with the changes in this issue.

For example, it works well for me in this project connect-test01.topcoder-dev.com/projects/9093, see video https://monosnap.com/file/Wn8TmMsD1YfHIJlKBki4XXVOFiVksK