Commands containing UTF8 characters mess up bash history

[Yuri]

I manipulate with some files containing UTF8 characters. The only 
commands I run are these:
./some-cmd < ../some-dir/utf8-containing-file-name.txt
vim ../some-dir/utf8-containing-file-name.txt

After a while of running of such commands, and going back and forth in 
history and rerunning them, the history becomes messed up. The 'unkown 
character' question mark appears in the middle, some of them become 
concatenated. History becomes unusable.

I am sure you will be able to reproduce this. Otherwise is kind of hard 
to create a test case for this kind of problem. But I am sure bash 
doesn't treat command, or some part of it, as utf8, and confuses number 
of characters and number of bytes.

bash-4.2.45_1

Yuri