Bug in downcase-region when using cua-set-rectangle-mark?

Question

Is the following a bug or a feature? If the former, how do I file? If the latter, can someone explain the logic?

On the following content in my buffer (*scratch*), upon marking the inner rectangle consisting of "FG" and "JK" using C-return

ABCD
EFGH
IJKL
MNOP

Applying downcase-region yields the following unexpected result:

ABCD
Efgh
ijKL
MNOP

I would expect "fg" and "jk" to be downcased, and not "fgh" and "ij".

Answer 1

That looks like a bug to me. But it might be an enhancement request: have commands such as downcase-region act on a rectangle region.

In either case, use M-x report-emacs-bug to report it (you can use your own email client to send the info, if you like). The Emacs developers will let you know whether it is a bug or an enhancement request (or neither).