Function broot::verb::internal_focus::on_internal

pub fn on_internal(
    internal_exec: &InternalExecution,
    input_invocation: Option<&VerbInvocation>,
    trigger_type: TriggerType<'_>,
    selected_path: &Path,
    tree_options: TreeOptions,
    app_state: &AppState,
    cc: &CmdContext<'_>
) -> CmdResult

general implementation for verbs based on the :focus internal with optionally a bang or an argument.