[BUG] keyword argument completion does not work after continuation lines

[gohierf]

Is your enhancement request related to a problem? Please describe.
Sometimes keywords arguments are too long to write them all on a single line.
Robot Framework supports continuation lines for keywords arguments.
Robotcode also detects continuation lines for keywords arguments, as it displays the suggestion even on these lines.
However, argument autocompletion (using TAB) seems only available on the first line.

Describe the solution you'd like
I would like to be able to use autocompletion on continuation lines too.

Describe alternatives you've considered
For now I can write them all on the same line and let robotidy format to continuation lines.

Additional context
Autocompletion available here:

But not here:

[d-biehl]

This is strange, it works for some, but not for all... Try using the keyword Log and it works, but with Should Contain it doesn`t....

I need to investigate this...

[d-biehl]

this is a bug.