The deleting thing is another silly bug, it shouldn't work that way. I'll correct it.

About the deleted triple quotes: I adopted the behavior of the Scala Plugin for IntelliJ IDEA. I like it because one can narrow triple quotes to single quotes. For non empty multi line strings the behavior is not that useful, I agree. The problem is that when one deletes accidentally a quotation mark of the opening triple quote, one can't easily restore it on typing it again because the ending quotes are inserted too (this is due to the fact that `AutoEditStrategy` is not aware of compile errors). Thus, both solutions are not optimal, but for the accidentally deletion there is to way to do a Undo Typing action (maybe that makes it better).

The shrinking may be confusing for some people, I'll look how it fells when it is only activated for empty strings.