bug#15977: 24.3.50; enhancement request: `sample' for Customize colors should show fg & bg

[Drew Adams]

Please change `sample' for a color value in Customize so that it shows
the color both as a foreground and as a background.  E.g., show `sam' as
foreground and `ple' as background.

A color can be used for either.  This would give a less misleading idea
of the effect of the option value.

For example, consider a color value that is used only as a background.
It makes little sense to show its sample as only a foreground.



In GNU Emacs 24.3.50.1 (i686-pc-mingw32)
 of 2013-11-20 on LEG570
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --enable-checking 'CFLAGS=-O0 -g3' CPPFLAGS=-DGLYPH_DEBUG=1'