set the PS1 env with SGR cause cusor problem

[tianlijian]

1. add the "export PS1='[\[\e[1;34m\]\W\[\e[0m\]]\$ '" to /etc/profile
or ~/.bash_profile .
   The statement mush be putted in the configuration file, can not
execute the bash command line, otherwise the problem will not occur.
2. type the command 'one two three four five six' in the command line.
3 .type 'M-7 C-b' command several times , you will see the display in confusion.

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