Inline attachment div not centrable if image is resized

Not sure if this is a style-related issue. Anyway, we're talking about prosilver.

If you attach an image inline and put it inside a [center] tag (<div style="text-align: center">...</div>) the image is correctly centered, unless it got resized and linked; in this case the image is included within a div (class="inline-attachment") and a dl (class="thumbnail") which are 100% wide.
This causes two problems:

• the image is not centrable (the legend is, but the image itself isn't);
• if you click on the right of the image, it is selected, although you didn't click OVER the image, which is kinda surprising.

Proof of concept: http://www.gennarino.org/forum3/viewtopic.php?p=401#p401 (first image got resized, second one didn't; both should be centered; note the legend of the first image).

I guess that applying a "margin: auto" somewhere should solve the issue.