I know how to split windows (C-x 2 or C-x 3), and I know I can give a C-u number precursor to that to make the new window have that many lines, but is there (simple) way to “split window at current point”, which… does what it suggests (splits the window at the line where the cursor is)? I can’t find it, but it seems like a glaring omission if it’s not something that’s available. So glaring I might need to mark this post as NSFW so I can fill it with swearing.