- we enter the second prompt.
current-prefix-arg is non-nil, prefix-arg is nil.
- before running the first real event, we run the special iconify-frame
- event, but we pass the `special' arg to execute-command so
+ event, but we pass the `special' arg to command-execute so
current-prefix-arg and prefix-arg are left untouched.
- here we foolishly copy the non-nil current-prefix-arg to prefix-arg.
- the next key event will have a spuriously non-nil current-prefix-arg. */