idlwave-completion-restore-window-configuration

idlwave-completion-restore-window-configuration is a variable defined in `idlwave.el'.
Its value is

t

Documentation:
Non-nil means, try to restore the window configuration after completion.
When completion is not unique, Emacs displays a list of completions.
This messes up your window configuration. With this variable set, IDLWAVE
restores the old configuration after successful completion.

You can customize this variable.