On Fri 2020-05-22 19:58:19 +0100, Mark Walters wrote: > As far as I can see the split-window-sensibly version splits the > window into two equal parts, whereas the split-window-vertically > version (deliberately) makes the message pane bigger than the thread > pane. I find this argument compelling. When i've used split-pane MUAs, i pretty much always want the tree view smaller than the message pane. --dkg