Manuel Giraud <manuel@ledu-giraud.fr> writes:

> Hi,
>
> Here is a patch to avoid "wrong type error" upon comparision to zero of
> image-dired--number-of-thumbnails.  How to reproduce:
>
>     - Do not have an existing *image-dired* buffer
>     - Hit 'C-t a' (image-dired-display-thumbs-append) on an image file
>       from Dired

Maybe this new version can go in too.  It updates the thumbnails counter
when removing a thumbnail.  What is not updated though is the number of
the image which is assign with a text-property at insertion...  So it is
not complete but an improvement nevertheless.