For MediaWiki (recent comments | status changes | tags | authors | states | release notes | statistics)
One tiny tweak: removing the 'alt $1' alias for the keyword per IRC discussion (page and upright have such, but link and thumbnail don't). DOne in r41840.
Noticed another issue:
[[Image:Wiki.png|testing '''bold''' in alt]]
[[Image:Wiki.png|alt=testing '''bold''' in alt]]
render the alt text differently; the latter isn't stripping tags.
Fixed to my satisfcation in r42116