bug#50795: C-u C-x = improvements

[積丹尼 Dan Jacobson]

             position: 572 of 1124 (51%), column: 3
            character: F (displayed as F) (codepoint 70, #o106, #x46)
              charset: ascii (ASCII (ISO646 IRV))
code point in charset: 0x46
               script: latin
               syntax: w        which means: word
             category: .:Base, L:Left-to-right (strong), a:ASCII, l:Latin, 
r:Roman
             to input: type "C-x 8 RET 46" or "C-x 8 RET LATIN CAPITAL LETTER F"
          buffer code: #x46
            file code: #x46 (encoded by coding system utf-8)
              display: by this font (glyph code)
                                                ^ I would add a colon (:) here,
                                                Else the next line seems to
                                                have a header field "x":
    x:-sony-fixed-medium-r-normal--16-120-100-100-c-80-iso8859-1 (#x46)
                                                Or maybe it does.

Character code properties: customize what to show
  name: LATIN CAPITAL LETTER F
  general-category: Lu (Letter, Uppercase)
  decomposition: (70) ('F')