fix(setreg): use better estimate of register width

vim-patch:9.2.1175: setreg() block width wrong for unprintable chars

When yanking, the width of a <c-v>{motion}y register
is determined by the virtual colums of the text. However
in setreg() in 'b' mode use an idosyncratic width measurement
where C0 control chars (ASCII 0x00 - 0x19) and invalid UTF-8 bytes
have width 1 instead of their display width (2 or 4 cells).

Consider the following test case:

    let strings = ['"reference', '"Übel', "\"aa\x07bb", "\"qq\x82", "\"x\nbabbel"]

    for string in strings
      call append('$', string)
      exec "normal G0\<c-v>$\"ay"
      let one = getregtype('a')
      if string != strings[-1]
        call setreg("b", string, 'b')
        let two = getregtype('b')
      else
        let two = "na"
      endif
      call setreg("c", [string], 'b')
      let three = getregtype('c')
      call append('$', '"yank: '.one.", string: ".two.", list: ".three)
    endfor

AFter this fix, all the three ways of measuring the width gives
equal values (or two, in the case of not being able to use setreg()
with a plain string in the first case)

0 files changed, 0 insertions, 0 deletions