copying to clipboard silently discards lines

[Chong Yidong]

I have not tested this on GNU/Linux, but the Windows build silently
discards some of the text copied onto the clipboard when there are too
many lines. I think this problem first appeared a couple weeks ago. To
reproduce:

1. emacs -Q
2. Type the following into the *scratch* buffer:

(dotimes (i 1000)
  (insert (number-to-string i))
  (newline))

3. C-j
4. C-SPACE
5. C-x <
6. M-w      (on Windows, this copies the text to the clipboard too)
7. Paste the clipboard contents into another program, such as another
   instance of Emacs. You will see

...
824
825

The last hundred lines have silently disappeared.

In GNU Emacs 22.0.50.1 (i386-mingw-nt5.0.2195)
 of 2005-02-22 on FOO
Distributor `Microsoft Corp.', version 5.0.2195
configured using `configure --with-gcc (3.2) --no-opt'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENU
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t