How implement two columns widget?

Hello everybody!
I want to create custom widget which consists of two widget- Left and
Right.
Left has fixed width, Right takes all space left. Widget height is
defined by Right. Right just wraps all content it has. If I make
parent wider Right gets wider also.
The content of Left is scrollable. So, it doesn't matter how long it
is, Left height is always equal to Right height. Something like this:

-----------------------------------!
! Left ! Right content!
! content ! is always !
! could be! wrapped by !
! large ! right widget !
!----------------------------------!

If I make parent wider I am supposed to have picture like this:

-------------------------------------------!
! Left ! Right content is !
! content ! always wrapped by !
! could be! right widget !
!-------------------------------------------!

Any ideas to implement this?

Thank you,
Andrey

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