Incorrectly adding \< and \> when selection starts or ends with a multi-byte character.

[blankname]

If you visually select the question mark and press star in the following text:

texttext

It will search for \V\<\> and not find it.

I don't understand the logic in convert_2_word_pattern_4_visual.
Shouldn't the if conditions just be:

        if text =~# '^\k' && outer !~# '\k'

and

        if text =~# '\k$' && outer !~# '\k'

I would submit a pull request if I understood better.

Looks like this is where the behavior was changed originally:
thinca/vim-visualstar@34979b3