Replace deprecated style-related calls
Styles were used to apply theme to a file list and to a combo box. File lists are colored with CSS/CellRenderer now. Combo box is not colored at all (this happened during a migration to Gtk+3).
Honestly, I am not sure about combo box styling. Does it really needed? Of course, this is a matter of taste, but it did not look natural for me. Anyway, I've created an issue #139 (closed) for visibility.
Edited by Andrey Kutejko