bug#16062: 24.3; Missing .png file gives poor error message when opened

[Juri Linkov]

> IOW, Emacs does the same in this case as when you type
>
>   C-x C-f non-existent-file.c RET
>
> In the latter case, you get an empty buffer that is in CC mode, and a
> message "(New file)" in the echo area.

In this case the echo area displays "Loading cc-langs...done",
but not "(New file)".

If we'll remove the message "Cannot display image: (Cannot
determine image type)" from image-mode.el, then it still will
display "Type C-c C-c to view the image as an image.",
but not "(New file)" (but it's still visible in the *Messages* buffer).

So the problem of overridden messages is general.  A possible solution
is to collect a batch of the latest messages and display them in the
multi-line echo area.