[bug] getchar(0) should not return `<80><fc>^B`

execute the following commands:
:set nomore
:while 1|sleep 1|echo getchar(0)|endw

if input the key <shift-leftmouse>, the output will be:
<80><fc>^B<80><fd>,
<80><fc>^B<80><fd>.
<80><fc>^B
<80><fc>^B
<80><fc>^B
<80><fc>^B
...
I think the output should be
<80><fc>^B<80><fd>,
<80><fc>^B<80><fd>.
0
0
0
...
There is a bug here.

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