bug#13503: 24.3.50; option `scroll-bar-adjust-thumb-portion'

[Drew Adams]

Where is it?  What is it?
 
It is not autoloaded.  It is called out in NEWS.  Grepping Lisp sources
shows that it is mentioned only in cus-start.el.  Where is the doc?
 
cus-start says it was created in Emacs 24.4.  How's that?  24.3 has not
even been released yet, but this is in what will become the 24.3 NEWS.
 
 
 
In GNU Emacs 24.3.50.1 (i386-mingw-nt5.1.2600)
 of 2013-01-18 on ODIEONE
Bzr revision: 111548 sdl.web@gmail.com-20130118182218-6ywd47qsbnow6nsg
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (4.7) --no-opt --enable-checking --cflags
 -IC:/Devel/emacs/build/include --ldflags -LC:/Devel/emacs/build/lib'