BUG: DEC private mode saving does not save low state after saving high state

[Patrick Hemmer]

Whenever you use the escape code "ESC [ ? Pm s" to save a high state, if 
you later change the state to low and save it again, then restore it, 
the high state is restored, not the low state.

Duplicate:
echo -e '\e[?9h' # enable high state for mouse reporting
echo -e '\e[?9s' # save state
echo -e '\e[?9l' # disable mouse reporting
echo -e '\e[?9s' # save state
echo -e '\e[?9r' # restore state
(click somewhere and watch escape codes get sent to the terminal)

The bug is on line 3584 of command.C . Its saving by doing an |= 
operation. Since the previously saved state is high, when you 'or' it 
with a low bit, the high bit remains.
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