Auto reindentation of multi-line string literals

[FroMage]

When I have:

throws(`class Exception`, "Follows a long
                           multiline string")
void f(){}

And I press ENTER right before the string, to indent it, I get:

throws(`class Exception`, 
  "Follows a long
                           multiline string")
void f(){}

Which is just wrong now. I think we should do something about the rest of the multi-line string when changing its first line, no?