`minibuffer-message-at-end' would have no
effect when the minibuffer is not active.
OK, I understand you now, I think. `message' does this:
if `minibufferp',
then if `minibuffer-message-at-end'
then don't erase minibuffer, but append message there
else temporarily replace minibuffer contents with message
else temporarily replace any minibuffer contents with message
`minibuffer-message' will just call `message' with non-nil
`minibuffer-message-at-end'. (However, to keep the current behavior in all
cases, it should not call `message' if the minibuffer is not active, but
should instead do nothing.)
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