Hi,

Org mode lost the ability to reuse already generated latex preview
images in commit 27101a3e0ee7. Now it just regenerates all of them every
time.

I don't see a reason for removing this feature (am I missing
something?), so here is a little patch reintroducing that feature. I'm
also mailing the author of that commit.

Abdó Roig-Maranges.