bug#33631: 26.1.90; Image mode should keep scale on auto-revert

[Juri Linkov]

> Say I set the image to fit window's width. Then turn auto-revert-mode
> on. This is for example to track a plot I'm updating from an interactive
> python session using matplotlib. This kind of exploratory usage is
> common nowadays and it would be nice if emacs supported it out of the
> box. Problem is that each time the buffer reverts the image restores its
> full size.

I guess this happens only when the image buffer is not selected in a window
at the time when the revering happens?