Pencil icon in user profile can be displayed white over white and thus not be visible

If the @btn-default-color is set to white in the theme, the pencil icon in the XWikiUserSheet will be displayed white over white, because it is using that default button color expecting it to be dark, over a the @xwiki-page-content-bg body background color (which is usually light) (styles here)

Here is a screenshot of the issue:

Why not using @text-color instead for the icon color? This will ensure it is always visible according to @wiki-page-content-bg.