up/down scrolls through previous, e.g., subject lines. But cannot return to current/initial one

[Ulrich]

The up/down keys allow you to use previously used subject lines (and other lines, too). But if you have started to write a new one and then press up (or down), your current line is lost.

It would be better that mutt would remember the current line and one could return to it with the same number of ups and downs.