Import qualified does not write temporarily to the buffer

[justinwoo]

Add import will write to a temporary file and do replacements on the buffer, but add import qualified will write to the whole file and require reverting the buffer.

https://github.com/purescript-emacs/psc-ide-emacs/blob/230101a3d56c9e062c3ce2bf9a4dc077e5607cc0/psc-ide.el#L533-L569