Bug#455688: Black boxes sometimes displayed instead of spaces

[Matt Kraai]

Package: gnome-terminal
Version: 2.18.3-1

When I use GNU Emacs in a Terminal window, the cursor is sometimes two
characters wide and there are sometimes black boxes displayed instead
of spaces.  This doesn't happen using xterm.  To reproduce the
problem, I run emacs.  Column number mode must be disabled.  Once I
press the space bar seven times, the cursor is two characters wide, in
the seventh and eigth columns.  If I enter a non-whitespace character
while the cursor is visible (i.e. hasn't blinked away), the black box
in the seventh column is still shown (e.g., "      Ba" where "B"
represents the black box and "a" is the character I entered).

-- 
Matt