Unexpected character on progress

[jrvjrv]

I am scrubbing an old ide ntfs disc that is not normally on this machine. I am seeing a "[" character on the progress bar. I don't see that output documented. I took a quick look through the code in progress.c, and I don't see how that could happen.

$ sudo scrub /dev/sdb1
[sudo] password for me: 
scrub: using NNSA NAP-14.1-C patterns
scrub: please verify that device size below is correct!
scrub: scrubbing /dev/sdb1 500105217024 bytes (~465GB)
scrub: random  |................................................|
scrub: random  |................................................|
scrub: 0x00    |..........................................[...  |

If it's expected it would be nice to document it.

[jrvjrv]

It occurred to me that the extra character was not output from scrub but rather a character from the keyboard that got mixed in to the output stream when the window was inadvertently active. A quick test showed this was likely

scrub: random  |................................................|
scrub: random  |................................................|
scrub: 0x00    |..........................................[......
scrub: verify  |........................................asdf........

This is perhaps still a bug, but its character is not what I had thought. I will leave the issue active in case it is an easy fix to suppress echoing characters from the keyboard or you think it should be documented.