Properly handle move up zero lines in TerminalMenus. (JuliaLang#38630)

stdlib/REPL/src/TerminalMenus/AbstractMenu.jl

@@ -322,7 +322,14 @@ function printmenu(out::IO, m::AbstractMenu, cursoridx::Int; oldstate=nothing, i
  # like clamp, except this takes the min if max < min
  m.pageoffset = max(0, min(cursoridx - m.pagesize ÷ 2, lastoption - m.pagesize))
  else
- print(buf, "\x1b[999D\x1b[$(ncleared)A") # move left 999 spaces and up `ncleared` lines
+ print(buf, "\r")
+ if ncleared > 0
+ # Move up `ncleared` lines. However, moving up zero lines
+ # is interpreted as one line, so need to do this
+ # conditionally. (More specifically, the `0` value means
+ # to use the default, and for move up this is one.)
+ print(buf, "\x1b[$(ncleared)A")
+ end
  end
 
  nheaderlines = 0
@@ -354,7 +361,7 @@ function printmenu(out::IO, m::AbstractMenu, cursoridx::Int; oldstate=nothing, i
  printcursor(buf, m, i == cursoridx)
  writeline(buf, m, i, i == cursoridx)
 
- (firstline == lastline || i != lastline) && print(buf, "\r\n")
+ (i != lastline) && print(buf, "\r\n")
  end
 
  newstate = nheaderlines + lastline - firstline # final line doesn't have `\n`