bug#67452: 30.0.50; [PATCH] Make split-root-window functions handle argument

[Juri Linkov]

> Thanks, I've now installed the change on the emacs-29 branch, using
> the "p" interactive spec, and I'm closing this bug.

The commit cd477bf07d8 broke normal use of split-root-window commands
without arguments:

0. emacs-29 -Q
1. C-x 2
2. C-x w 3

Debugger entered--Lisp error: (error "Window #<window 7> too small for 
splitting")
  error("Window %s too small for splitting" #<window 7>)
  split-window(#<window 7> 1 t)
  split-window-right(1 #<window 7>)
  split-root-window-right(1)
  funcall-interactively(split-root-window-right 1)
  command-execute(split-root-window-right)

because the "p" interactive spec uses SIZE=1.