Auto-resizing of images in image-mode

[Eli Zaretskii]

Lately I noticed that visiting an image file automatically resizes it
to fit in the window, and resizing the window then scales the image to
fit.

This is a good feature (at least IMO), but:

  . It is completely undocumented, AFAICT: not a word about this in
    NEWS, and nothing in the manual.  So much so that I originally
    thought it was some inadvertent side effect of an unrelated
    change.

  . Moreover, the manual makes a point of describing what cursor
    motion commands do when an image is displayed that is larger than
    the window, but this can no longer be seen when visiting an image
    file, because it is always smaller than the window.

  . There's no way to turn this behavior off, so it's practically
    impossible to view an image in its original size (unless you
    manually invoke insert-image).  It is not outlandish to envision
    users who might want to opt out.

  . The time interval after which the idle timer resizes the image is
    fixed and cannot be customized.  The 1 sec interval looks too long
    to me, FWIW, but if it were customizable, my personal preferences
    would not have mattered.

Can we please make this useful feature perfect by fixing these minor
deficiencies?

Thanks.