patch 9.0.2075: TextChangedI may not always trigger

patch 9.0.2075: TextChangedI may not always trigger

Problem:  TextChangedI may not always trigger
Solution: trigger it in more cases: for insert/
          append/change operations, and when
          opening a new line,

fixes: #13367
closes: #13375

Signed-off-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Evgeni Chasnovski <evgeni.chasnovski@gmail.com>