[QUESTION] Add conditional indicator to `mode-line-misc-info' not working

["Christopher M. Miles" <numbchild@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 1089 bytes --]


I added bellowing init config to my Emacs:

#+begin_src emacs-lisp
(add-to-list 'mode-line-misc-info
             '(image-mode (:eval (image-size (image-get-display-property) :pixels))))
#+end_src

But it's not displaying image info on mode-line when I open an image
with [M-x find-file RET /path/to/image.png RET].

I searched GitHub code for `mode-line-misc-info` examples. I don't know
what does the `image-mode` mean in upper code. Is it a condition which
only evaluate following `(:eval (image-size ...))` snippet in buffer
which major-mode is `image-mode`?

How to correctly add indicator to `mode-line-misc-info`? Please provide
some variant examples. Thanks very much.

Also the docstring of `mode-line-misc-info` is not helpful, please improve it.

My Emacs version info: GNU Emacs 30.0.50

-- 

[ stardiviner ]
I try to make every word tell the meaning that I want to express without misunderstanding.

Blog: https://stardiviner.github.io/
IRC(libera.chat, freenode): stardiviner, Matrix: stardiviner
GPG: F09F650D7D674819892591401B5DF1C95AE89AC3

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 487 bytes --]