bug#5311: 23.1.91; barf in *vc-change-log*

[Marshall, Simon]

Start src/emacs -Q, visit a CVS controlled file, and do C-x v l (ie, run vc-print-log). 

Emacs displays the *vc-change-log* as expected.

However, I cannot use mouse-1 in the *vc-change-log* buffer, eg, to copy some text.  When I mouse-1 I get:

Debugger entered--Lisp error: (void-function widget-button-click)

I haven't tried 23.1.90.

In GNU Emacs 23.1.91.1 (sparc-sun-solaris2.8, Motif Version 2.1.0)
 of 2010-01-04 on risksun2
Windowing system distributor `Hummingbird Ltd.', version 11.0.100015
configured using `configure  '--without-makeinfo' '--x-includes=/usr/openwin/include:/usr/dt/include:/usr/local/include:/usr/local/X11/include' '--x-libraries=/usr/openwin/lib:/usr/dt/lib:/usr/local/lib:/usr/local/X11/lib' '--with-x-toolkit=motif' '--with-jpeg=no' '--with-gif=no' '--with-tiff=no''

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: C
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Outline

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  view-mode: t

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