Issue with UI of 'MSGMessengerViewController' (iOS 13)
Steps:
- push in Navigation controller instance of MSGMessengerViewController subclass
- tap in text field of MSGInputView
- keyboard appears
- minimize the application by press of 'Home'
- activate application by tap on app icon
- show modally login screen (on top of a chat screen)
- enter credentials and dismiss login screen
- see issue with UI
Now it was fixed in my project by set up zero to 'topConstraint.constant' (KeyboardLayoutGuide) in 'viewWillAppear' of MSGMessengerViewController subclass.

Issue with UI of 'MSGMessengerViewController' (iOS 13)
Steps:
Now it was fixed in my project by set up zero to 'topConstraint.constant' (KeyboardLayoutGuide) in 'viewWillAppear' of MSGMessengerViewController subclass.