Completion buffer resizing can be improved
Resizing sometimes leads to flicker. It seems that the buffer is displayed briefly and then resized.
Add an option or example configuration which shows how to achieve a grow-only or fixed size buffer.
The last line is sometimes cut off due to the pixel resizing. It would be better if the lines are displayed fully. I remember that I had to fight a lot in Vertico to achieve beautiful resizing without cutoffs. I think I could not use fit-window-to-buffer since it felt broken in some ways. In Vertico the problem is of course more severe since only a handful of candidates are shown and minibuffer resizing generally seems to be more problematic due to special casing.