[Bug 397] New: ?WQ? command unexpectedly can write and save the file in vi

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=397

              Host: i686
           Summary: ?WQ? command unexpectedly can write and save the file in
                    vi
           Product: Busybox
           Version: 1.12.x
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Keywords: FIXME
          Severity: enhancement
          Priority: P3
         Component: Standard Compliance
        AssignedTo: unassigned at busybox.net
        ReportedBy: xhcbrave at gmail.com
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


When we use vi command to create file and do some input, then the file can be
unexpectedly whitened and saved with capital ":WQ" command. The same issue can
be found for ":Q" ":Q!" ":W"
1. use vi command to create some file
>> vi temp.txt
2. input some character in file and use capital ?: WQ? command to exit the vi.
>> :WQ
3. vi exit successfully and the file is saved


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