Qt playlist selection and removal

When we remove items from the playlist, the UI is not updated correctly (cf screenshots).

initial state

Added attachment:

• remove_1.png

I select an item

Added attachment:

• remove_2.png

I press Delete

Added attachment:

• remove_3.png

or I select a slice of items

Added attachment:

• remove_slice_2.png

then I press Delete

Added attachment:

• remove_slice_3.png

See fc423408

added Status::fixed label

closed