Check if object is a dock view plugin of specific type
     
    
    Usage
    is_dock_view_plugin(x, type)
 
     
    
    Arguments
- x
 
An object to test.
 
- type
 
Character string specifying plugin type ("add_tab" or "remove_tab").
 
 
    
    Value
    Logical value indicating whether the object is the specified plugin type.