[Help-bash] Different completion behavior for ':' when there are other files or not

[Peng Yu]

Hi,

In /tmp/a, there is only ':', but nothing else.

/tmp/a$ mkdir :
/tmp/a$ cd :<TAB>

The command completion of the above one becomes the following (which
is not correct).

/tmp/a$ cd :\:/

But if I create an addition file, then the command completion of 'cd
:<TAB>' will work correctly.
/tmp/a$ touch xxx.txt

Is it a bug in bash? Or I need to somehow configure bash correctly?

-- 
Regards,
Peng