onProviderRemoved  
  fun onProviderRemoved(connectFlags: <Error class: unknown class> = ConnectFlags(0u), handler: (provider: CompletionProvider) -> Unit): <Error class: unknown class>(source)
The "provided-removed" signal is emitted when a provider has been removed from the completion.
Parameters
connectFlags 
a combination of ConnectFlags
handler
the Callback to connect. Params: provider a #GtkSourceCompletionProvider