When editing a command of the history buffer,
then browse away and back to this command (via up-/down-key),
and continue editing, some characters seem to switch their values.

How to reproduce (just a simple example):

• start bpython
• enter "x = 5"
• enter "y = [1, 2, 3]"
• press UP key to select the "y = [1, 2, 3]" line again
• remove the "," behind the "2" => "y = [1, 2 3]"
• press UP key then DOWN again
• now it shows "y = [1, 2, 3]" again
• remove the "," behind the "2" again
• retype the "," (you don't need to change cursor position at this moment)
• the space behind that "," switches to second "," => "y = [1, 2,,3]"

• Bitbucket: https://bitbucket.org/bobf/bpython/issue/10
• Originally Reported By: Anonymous
• Originally Created At: 2009-06-03T02:24:35.620