bug#3181: 23.0.92; Windows: text-scale-decrease changes font family, not just font size

On Sat, May 2, 2009 at 12:34 AM, Jason Rumney <[email protected]> wrote:
> Please type C-u C-x = before and after decreasing the font size, and report
> exactly what fonts are used in each case.

Here's the info from before I shrank the font:

            character: ; (59, #o73, #x3b)
    preferred charset: ascii (ASCII (ISO646 IRV))
           code point: 0x3B
               syntax: < 	which means: comment
             category: .:Base, a:ASCII, l:Latin, r:Roman
          buffer code: #x3B
            file code: #x3B (encoded by coding system iso-latin-1-dos)
              display: by this font (glyph code)
        uniscribe:-outline-Courier
New-normal-normal-normal-mono-13-*-*-*-c-*-iso10646-1 (#x1E)

    Character code properties: customize what to show
      name: SEMICOLON
      general-category: Po (Punctuation, Other)

    There are text properties here:
      face                 font-lock-comment-delimiter-face
      fontified            t

And here's the info from after:

            character: ; (59, #o73, #x3b)
    preferred charset: ascii (ASCII (ISO646 IRV))
           code point: 0x3B
               syntax: < 	which means: comment
             category: .:Base, a:ASCII, l:Latin, r:Roman
          buffer code: #x3B
            file code: #x3B (encoded by coding system iso-latin-1-dos)
              display: by this font (glyph code)
        uniscribe:-outline-Arial-normal-normal-normal-sans-11-*-*-*-p-*-iso10646-1
(#x1E)

    Character code properties: customize what to show
      name: SEMICOLON
      general-category: Po (Punctuation, Other)

    There are text properties here:
      face                 font-lock-comment-delimiter-face
      fontified            t

    [back]

For what it's worth, I couldn't reproduce the problem on Windows XP,
using Emacs as of

    commit a52d2b7...
    Author: Chong Yidong <[email protected]>
    Date:   Sat Apr 25 15:27:45 2009 +0000

       * simple.el (line-move-visual): If point is stuck moving backwards
       against a display string, temporarily ignore the goal
       column (Bug#3020).

In that case, the output from C-u C-x = was

           character: ; (59, #o73, #x3b)
    preferred charset: ascii (ASCII (ISO646 IRV))
          code point: 0x3B
              syntax: <    which means: comment
            category: .:Base, a:ASCII, l:Latin, r:Roman
         buffer code: #x3B
           file code: #x3B (encoded by coding system iso-latin-1-dos)
             display: by this font (glyph code)
       uniscribe:-outline-Courier
New-normal-normal-normal-mono-13-*-*-*-c-*-iso10646-1 (#x1E)

    Character code properties: customize what to show
     name: SEMICOLON
     general-category: Po (Punctuation, Other)

    There are text properties here:
     face                 font-lock-comment-delimiter-face
     fontified            t