Gtk::Label text Orientation

[Pedro Sousa <pedro morais sousa gmail com>]

Hello,

I am trying to change the text orientation for a Gtk::Label to vertical.

Using Gtkmm3 we could do it with

Gtk::Label tab;
tab.set_angle(90);

but in Gtkmm4 this function does not exist. 

Can you tell me the substituting function to change the text orientation?

Regards,

Pedro Sousa