On 16 June 2017 at 02:25, Eli Zaretskii <eliz@gnu.org> wrote:

Right, I think it used to work only in very simple situations, and
definitely not when the same buffer is displayed at different
positions in several windows.

Am I to assume that this is not something that is expected to work reliably? In that case SLIME needs to be changed in a more significant way than I had expected. For reference, I reported this on the SLIME bug tracker: https://github.com/slime/slime/issues/391